diff --git a/patches/common/chromium/.patches b/patches/common/chromium/.patches
index 1ce224b5f92b1..c3a05e006a371 100644
--- a/patches/common/chromium/.patches
+++ b/patches/common/chromium/.patches
@@ -110,3 +110,4 @@ fire_caret_location_change_when_focus_moves_from_ui_to_content.patch
 do_not_show_virtual_keyboard_for_all_mouse_inputs.patch
 setup_the_observer_before_calling_displayvirtualkeyboard.patch
 workaround_apparent_data_corruption_in_blockfile_on_os_x_10_14_by.patch
+mediacontrols_disconnect_observers_when_controls_are_hidden.patch
diff --git a/patches/common/chromium/browser_compositor_mac.patch b/patches/common/chromium/browser_compositor_mac.patch
index 9aad97014a7f1..cb6210eb21cbf 100644
--- a/patches/common/chromium/browser_compositor_mac.patch
+++ b/patches/common/chromium/browser_compositor_mac.patch
@@ -29,7 +29,7 @@ diff --git a/content/browser/renderer_host/browser_compositor_view_mac.mm b/cont
 index 92afcc77910610e53378f55adc003cc1bdf3109a..42bd6fd7c169de36c775471c68b456f1386ff666 100644
 --- a/content/browser/renderer_host/browser_compositor_view_mac.mm
 +++ b/content/browser/renderer_host/browser_compositor_view_mac.mm
-@@ -81,6 +81,12 @@ BrowserCompositorMac::~BrowserCompositorMac() {
+@@ -81,6 +81,12 @@
    DCHECK_EQ(1u, num_erased);
  }
  
diff --git a/patches/common/chromium/crashpad_http_status.patch b/patches/common/chromium/crashpad_http_status.patch
index 1acbc21e8fc82..4f7a9ff88725c 100644
--- a/patches/common/chromium/crashpad_http_status.patch
+++ b/patches/common/chromium/crashpad_http_status.patch
@@ -22,7 +22,7 @@ diff --git a/third_party/crashpad/crashpad/util/net/http_transport_mac.mm b/thir
 index 8d5f78cc6efc8b8e349958f51c78921a8c163c4e..a433bb357da5865144ade7d3663b1c9b36199f8e 100644
 --- a/third_party/crashpad/crashpad/util/net/http_transport_mac.mm
 +++ b/third_party/crashpad/crashpad/util/net/http_transport_mac.mm
-@@ -293,7 +293,7 @@ bool HTTPTransportMac::ExecuteSynchronously(std::string* response_body) {
+@@ -293,7 +293,7 @@ static void Unschedule(CFReadStreamRef stream,
        return false;
      }
      NSInteger http_status = [http_response statusCode];
diff --git a/patches/common/chromium/mac_fix_form_control_rendering_on_10_14_mojave.patch b/patches/common/chromium/mac_fix_form_control_rendering_on_10_14_mojave.patch
index 151a530df4e06..5bae6c27ef777 100644
--- a/patches/common/chromium/mac_fix_form_control_rendering_on_10_14_mojave.patch
+++ b/patches/common/chromium/mac_fix_form_control_rendering_on_10_14_mojave.patch
@@ -56,7 +56,7 @@ diff --git a/services/service_manager/sandbox/mac/sandbox_mac.mm b/services/serv
 index d69fcc0d4c5c2471163280c03a9fd9366e05031d..cdd7b7f6723162d6875c4d11379837708bdde79d 100644
 --- a/services/service_manager/sandbox/mac/sandbox_mac.mm
 +++ b/services/service_manager/sandbox/mac/sandbox_mac.mm
-@@ -81,6 +81,21 @@ static_assert(arraysize(kDefaultSandboxTypeToResourceIDMapping) ==
+@@ -81,6 +81,21 @@
                    size_t(SANDBOX_TYPE_AFTER_LAST_TYPE),
                "sandbox type to resource id mapping incorrect");
  
@@ -78,7 +78,7 @@ index d69fcc0d4c5c2471163280c03a9fd9366e05031d..cdd7b7f6723162d6875c4d1137983770
  }  // namespace
  
  // Static variable declarations.
-@@ -242,6 +257,9 @@ bool SandboxMac::Enable(SandboxType sandbox_type) {
+@@ -242,6 +257,9 @@
    if (!compiler.InsertBooleanParam(kSandboxMacOS1013, macos_1013))
      return false;
  
diff --git a/patches/common/chromium/mas-cfisobjc.patch b/patches/common/chromium/mas-cfisobjc.patch
index c1dc41702a15b..180423f3b8ede 100644
--- a/patches/common/chromium/mas-cfisobjc.patch
+++ b/patches/common/chromium/mas-cfisobjc.patch
@@ -9,7 +9,7 @@ diff --git a/base/mac/foundation_util.mm b/base/mac/foundation_util.mm
 index 15fc15ba307e18f438852f00f41b2f5ecf7ff85f..7ca4e0ec5ca87f34e0baa22ba0b704e25fe7ca21 100644
 --- a/base/mac/foundation_util.mm
 +++ b/base/mac/foundation_util.mm
-@@ -26,7 +26,6 @@ CFTypeID SecKeyGetTypeID();
+@@ -26,7 +26,6 @@
  #if !defined(OS_IOS)
  CFTypeID SecACLGetTypeID();
  CFTypeID SecTrustedApplicationGetTypeID();
@@ -17,7 +17,7 @@ index 15fc15ba307e18f438852f00f41b2f5ecf7ff85f..7ca4e0ec5ca87f34e0baa22ba0b704e2
  #endif
  }  // extern "C"
  
-@@ -325,8 +324,7 @@ NSFont* CFToNSCast(CTFontRef cf_val) {
+@@ -325,8 +324,7 @@ void SetBaseBundleID(const char* new_base_bundle_id) {
        const_cast<NSFont*>(reinterpret_cast<const NSFont*>(cf_val));
    DCHECK(!cf_val ||
           CTFontGetTypeID() == CFGetTypeID(cf_val) ||
@@ -27,7 +27,7 @@ index 15fc15ba307e18f438852f00f41b2f5ecf7ff85f..7ca4e0ec5ca87f34e0baa22ba0b704e2
    return ns_val;
  }
  
-@@ -394,9 +392,6 @@ CFCast<CTFontRef>(const CFTypeRef& cf_val) {
+@@ -394,9 +392,6 @@ CTFontRef NSToCFCast(NSFont* ns_val) {
      return (CTFontRef)(cf_val);
    }
  
diff --git a/patches/common/chromium/mas_blink_no_private_api.patch b/patches/common/chromium/mas_blink_no_private_api.patch
index d687746c3eceb..3870d2481d5d6 100644
--- a/patches/common/chromium/mas_blink_no_private_api.patch
+++ b/patches/common/chromium/mas_blink_no_private_api.patch
@@ -18,7 +18,7 @@ index 94afefcee81b87c05bf9b1199d90d3d4b5ea84a6..2ec7f04c71824b47de1ddbf1f0e8625d
  extern "C" {
  
  // Kill ring calls. Would be better to use NSKillRing.h, but that's not
-@@ -39,38 +40,53 @@ NSString* _NSYankFromKillRing();
+@@ -39,38 +40,53 @@
  void _NSNewKillRingSequence();
  void _NSSetKillRingToYankedState();
  }
@@ -92,7 +92,7 @@ index 7a1260db0a139f9f3f8a823af2c220f36162812a..bf9cf7046e2fc9cdfee5b92f2a348185
  
  namespace blink {
  
-@@ -73,10 +75,12 @@ bool ThemePainterMac::PaintTextField(const Node* node,
+@@ -73,10 +75,12 @@ void _NSDrawCarbonThemeListBox(NSRect frame,
    // behavior change while remaining a fragile solution.
    // https://bugs.chromium.org/p/chromium/issues/detail?id=658085#c3
    if (!use_ns_text_field_cell) {
@@ -105,7 +105,7 @@ index 7a1260db0a139f9f3f8a823af2c220f36162812a..bf9cf7046e2fc9cdfee5b92f2a348185
      return false;
    }
  
-@@ -162,10 +166,12 @@ bool ThemePainterMac::PaintTextArea(const Node* node,
+@@ -162,10 +166,12 @@ void _NSDrawCarbonThemeListBox(NSRect frame,
                                      const PaintInfo& paint_info,
                                      const IntRect& r) {
    LocalCurrentGraphicsContext local_context(paint_info.context, r);
diff --git a/patches/common/chromium/mas_no_private_api.patch b/patches/common/chromium/mas_no_private_api.patch
index e63ef305d557a..3df25dff8d7b0 100644
--- a/patches/common/chromium/mas_no_private_api.patch
+++ b/patches/common/chromium/mas_no_private_api.patch
@@ -41,7 +41,7 @@ diff --git a/content/browser/accessibility/browser_accessibility_cocoa.mm b/cont
 index 07e9862b76a920438a779f22d67d3a45ab39abf7..efa52aa9de2f819f28109978c8cef518325ef70a 100644
 --- a/content/browser/accessibility/browser_accessibility_cocoa.mm
 +++ b/content/browser/accessibility/browser_accessibility_cocoa.mm
-@@ -135,6 +135,7 @@ NSDictionary* attributeToMethodNameMap = nil;
+@@ -135,6 +135,7 @@
  // VoiceOver uses -1 to mean "no limit" for AXResultsLimit.
  const int kAXResultsLimitNoLimit = -1;
  
@@ -49,7 +49,7 @@ index 07e9862b76a920438a779f22d67d3a45ab39abf7..efa52aa9de2f819f28109978c8cef518
  extern "C" {
  
  // The following are private accessibility APIs required for cursor navigation
-@@ -341,6 +342,7 @@ NSAttributedString* GetAttributedTextForTextMarkerRange(
+@@ -341,6 +342,7 @@ void AddMisspelledTextAttributes(
    AddMisspelledTextAttributes(text_only_objects, attributed_text);
    return [attributed_text attributedSubstringFromRange:range];
  }
@@ -57,7 +57,7 @@ index 07e9862b76a920438a779f22d67d3a45ab39abf7..efa52aa9de2f819f28109978c8cef518
  
  // Returns an autoreleased copy of the AXNodeData's attribute.
  NSString* NSStringForStringAttribute(
-@@ -595,7 +597,9 @@ NSString* const NSAccessibilityRequiredAttributeChrome = @"AXRequired";
+@@ -595,7 +597,9 @@ + (void)initialize {
        {NSAccessibilityDOMIdentifierAttribute, @"domIdentifier"},
        {NSAccessibilityEditableAncestorAttribute, @"editableAncestor"},
        {NSAccessibilityEnabledAttribute, @"enabled"},
@@ -67,7 +67,7 @@ index 07e9862b76a920438a779f22d67d3a45ab39abf7..efa52aa9de2f819f28109978c8cef518
        {NSAccessibilityExpandedAttribute, @"expanded"},
        {NSAccessibilityFocusableAncestorAttribute, @"focusableAncestor"},
        {NSAccessibilityFocusedAttribute, @"focused"},
-@@ -630,13 +634,17 @@ NSString* const NSAccessibilityRequiredAttributeChrome = @"AXRequired";
+@@ -630,13 +634,17 @@ + (void)initialize {
        {NSAccessibilityRowsAttribute, @"rows"},
        // TODO(aboxhall): expose
        // NSAccessibilityServesAsTitleForUIElementsAttribute
@@ -85,7 +85,7 @@ index 07e9862b76a920438a779f22d67d3a45ab39abf7..efa52aa9de2f819f28109978c8cef518
        {NSAccessibilitySizeAttribute, @"size"},
        {NSAccessibilitySortDirectionAttribute, @"sortDirection"},
        {NSAccessibilitySubroleAttribute, @"subrole"},
-@@ -1114,6 +1122,7 @@ NSString* const NSAccessibilityRequiredAttributeChrome = @"AXRequired";
+@@ -1114,6 +1122,7 @@ - (NSNumber*)enabled {
                                    ax::mojom::Restriction::kDisabled];
  }
  
@@ -93,7 +93,7 @@ index 07e9862b76a920438a779f22d67d3a45ab39abf7..efa52aa9de2f819f28109978c8cef518
  // Returns a text marker that points to the last character in the document that
  // can be selected with VoiceOver.
  - (id)endTextMarker {
-@@ -1124,6 +1133,7 @@ NSString* const NSAccessibilityRequiredAttributeChrome = @"AXRequired";
+@@ -1124,6 +1133,7 @@ - (id)endTextMarker {
    BrowserAccessibilityPositionInstance position = root->CreatePositionAt(0);
    return CreateTextMarker(position->CreatePositionAtEndOfAnchor());
  }
@@ -101,7 +101,7 @@ index 07e9862b76a920438a779f22d67d3a45ab39abf7..efa52aa9de2f819f28109978c8cef518
  
  - (NSNumber*)expanded {
    if (![self instanceActive])
-@@ -2029,6 +2039,7 @@ NSString* const NSAccessibilityRequiredAttributeChrome = @"AXRequired";
+@@ -2029,6 +2039,7 @@ - (NSValue*)selectedTextRange {
    return [NSValue valueWithRange:NSMakeRange(selStart, selLength)];
  }
  
@@ -109,7 +109,7 @@ index 07e9862b76a920438a779f22d67d3a45ab39abf7..efa52aa9de2f819f28109978c8cef518
  - (id)selectedTextMarkerRange {
    if (![self instanceActive])
      return nil;
-@@ -2061,6 +2072,7 @@ NSString* const NSAccessibilityRequiredAttributeChrome = @"AXRequired";
+@@ -2061,6 +2072,7 @@ - (id)selectedTextMarkerRange {
                                                 anchorAffinity, *focusObject,
                                                 focusOffset, focusAffinity));
  }
@@ -117,7 +117,7 @@ index 07e9862b76a920438a779f22d67d3a45ab39abf7..efa52aa9de2f819f28109978c8cef518
  
  - (NSValue*)size {
    if (![self instanceActive])
-@@ -2093,6 +2105,7 @@ NSString* const NSAccessibilityRequiredAttributeChrome = @"AXRequired";
+@@ -2093,6 +2105,7 @@ - (NSString*)sortDirection {
    return nil;
  }
  
@@ -125,7 +125,7 @@ index 07e9862b76a920438a779f22d67d3a45ab39abf7..efa52aa9de2f819f28109978c8cef518
  // Returns a text marker that points to the first character in the document that
  // can be selected with VoiceOver.
  - (id)startTextMarker {
-@@ -2103,6 +2116,7 @@ NSString* const NSAccessibilityRequiredAttributeChrome = @"AXRequired";
+@@ -2103,6 +2116,7 @@ - (id)startTextMarker {
    BrowserAccessibilityPositionInstance position = root->CreatePositionAt(0);
    return CreateTextMarker(position->CreatePositionAtStartOfAnchor());
  }
@@ -133,7 +133,7 @@ index 07e9862b76a920438a779f22d67d3a45ab39abf7..efa52aa9de2f819f28109978c8cef518
  
  // Returns a subrole based upon the role.
  - (NSString*) subrole {
-@@ -2405,12 +2419,14 @@ NSString* const NSAccessibilityRequiredAttributeChrome = @"AXRequired";
+@@ -2405,12 +2419,14 @@ - (NSAttributedString*)attributedValueForRange:(NSRange)range {
    NSMutableAttributedString* attributedValue =
        [[[NSMutableAttributedString alloc] initWithString:value] autorelease];
  
@@ -148,7 +148,7 @@ index 07e9862b76a920438a779f22d67d3a45ab39abf7..efa52aa9de2f819f28109978c8cef518
  
    return [attributedValue attributedSubstringFromRange:range];
  }
-@@ -2527,6 +2543,7 @@ NSString* const NSAccessibilityRequiredAttributeChrome = @"AXRequired";
+@@ -2527,6 +2543,7 @@ - (id)accessibilityAttributeValue:(NSString*)attribute
      return nil;
    }
  
@@ -156,7 +156,7 @@ index 07e9862b76a920438a779f22d67d3a45ab39abf7..efa52aa9de2f819f28109978c8cef518
    if ([attribute isEqualToString:@"AXUIElementForTextMarker"]) {
      BrowserAccessibilityPositionInstance position =
          CreatePositionFromTextMarker(parameter);
-@@ -2704,6 +2721,7 @@ NSString* const NSAccessibilityRequiredAttributeChrome = @"AXRequired";
+@@ -2704,6 +2721,7 @@ - (id)accessibilityAttributeValue:(NSString*)attribute
      NSString* text = GetTextForTextMarkerRange(parameter);
      return [NSNumber numberWithInt:[text length]];
    }
@@ -164,7 +164,7 @@ index 07e9862b76a920438a779f22d67d3a45ab39abf7..efa52aa9de2f819f28109978c8cef518
  
    if ([attribute isEqualToString:
        NSAccessibilityBoundsForRangeParameterizedAttribute]) {
-@@ -2741,6 +2759,7 @@ NSString* const NSAccessibilityRequiredAttributeChrome = @"AXRequired";
+@@ -2741,6 +2759,7 @@ - (id)accessibilityAttributeValue:(NSString*)attribute
      return nil;
    }
  
@@ -172,7 +172,7 @@ index 07e9862b76a920438a779f22d67d3a45ab39abf7..efa52aa9de2f819f28109978c8cef518
    if ([attribute isEqualToString:
             NSAccessibilityLineTextMarkerRangeForTextMarkerParameterizedAttribute]) {
      BrowserAccessibilityPositionInstance position =
-@@ -2820,6 +2839,7 @@ NSString* const NSAccessibilityRequiredAttributeChrome = @"AXRequired";
+@@ -2820,6 +2839,7 @@ AXPlatformRange range(position->CreatePreviousLineStartPosition(
  
      return @(child->GetIndexInParent());
    }
@@ -184,7 +184,7 @@ diff --git a/content/browser/accessibility/browser_accessibility_manager_mac.mm
 index 8e32a08226079c6d7515b8e784babacb3226ecd6..93bb7273684fa529bdc6049af2ed379f8b059397 100644
 --- a/content/browser/accessibility/browser_accessibility_manager_mac.mm
 +++ b/content/browser/accessibility/browser_accessibility_manager_mac.mm
-@@ -437,6 +437,7 @@ NSDictionary* BrowserAccessibilityManagerMac::
+@@ -437,6 +437,7 @@
        [user_info setObject:native_focus_object
                      forKey:NSAccessibilityTextChangeElement];
  
@@ -192,7 +192,7 @@ index 8e32a08226079c6d7515b8e784babacb3226ecd6..93bb7273684fa529bdc6049af2ed379f
        id selected_text = [native_focus_object selectedTextMarkerRange];
        if (selected_text) {
          NSString* const NSAccessibilitySelectedTextMarkerRangeAttribute =
-@@ -444,6 +445,7 @@ NSDictionary* BrowserAccessibilityManagerMac::
+@@ -444,6 +445,7 @@
          [user_info setObject:selected_text
                        forKey:NSAccessibilitySelectedTextMarkerRangeAttribute];
        }
@@ -220,7 +220,7 @@ index 1e2cc38d3868ceccf8e45f5f82f57bcaa478f982..daa934c345e2686fd2174b7721d0f69a
  
  namespace content {
  
-@@ -38,6 +40,7 @@ namespace {
+@@ -38,6 +40,7 @@ void _LSSetApplicationLaunchServicesServerConnectionStatus(
  // This disconnects from the window server, and then indicates that Chrome
  // should continue execution without access to launchservicesd.
  void DisconnectWindowServer() {
@@ -248,7 +248,7 @@ index 8b2092ec78f9f6bc1bd4c8af21ada74538f54d29..4f2ee8e2809790df68aedcee09462631
  extern "C" {
  // Undocumented IOBluetooth Preference API [1]. Used by `blueutil` [2] and
  // `Karabiner` [3] to programmatically control the Bluetooth state. Calling the
-@@ -47,6 +48,7 @@ extern "C" {
+@@ -47,6 +48,7 @@
  // [4] https://support.apple.com/kb/PH25091
  void IOBluetoothPreferenceSetControllerPowerState(int state);
  }
@@ -256,7 +256,7 @@ index 8b2092ec78f9f6bc1bd4c8af21ada74538f54d29..4f2ee8e2809790df68aedcee09462631
  
  namespace {
  
-@@ -120,8 +122,10 @@ BluetoothAdapterMac::BluetoothAdapterMac()
+@@ -120,8 +122,10 @@ CBCentralManagerState GetCBManagerState(CBCentralManager* manager) {
        controller_state_function_(
            base::BindRepeating(&BluetoothAdapterMac::GetHostControllerState,
                                base::Unretained(this))),
@@ -267,7 +267,7 @@ index 8b2092ec78f9f6bc1bd4c8af21ada74538f54d29..4f2ee8e2809790df68aedcee09462631
        should_update_name_(true),
        classic_discovery_manager_(
            BluetoothDiscoveryManagerMac::CreateClassic(this)),
-@@ -314,8 +318,12 @@ bool BluetoothAdapterMac::IsLowEnergyAvailable() {
+@@ -314,8 +318,12 @@ CBCentralManagerState GetCBManagerState(CBCentralManager* manager) {
  }
  
  bool BluetoothAdapterMac::SetPoweredImpl(bool powered) {
diff --git a/patches/common/chromium/mediacontrols_disconnect_observers_when_controls_are_hidden.patch b/patches/common/chromium/mediacontrols_disconnect_observers_when_controls_are_hidden.patch
new file mode 100644
index 0000000000000..82601324c12bb
--- /dev/null
+++ b/patches/common/chromium/mediacontrols_disconnect_observers_when_controls_are_hidden.patch
@@ -0,0 +1,148 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Michael Lippautz <mlippautz@chromium.org>
+Date: Wed, 26 Jun 2019 20:21:46 +0000
+Subject: MediaControls: Disconnect observers when controls are hidden
+
+Disconnect ResizeObserver from media controls when the controls are
+hidden. Otherwise, the obervsers are have pending activities (are
+observed) which makes them roots for the object graph, ultimately
+keeping elements (including e.g. HTMLVideoElement) and nodes alive.
+
+Bug: 969049
+Change-Id: I07a4470170f187631db307188f6cbe0052aa7d8c
+Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1677053
+Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
+Reviewed-by: Tommy Steimel <steimel@chromium.org>
+Reviewed-by: Kentaro Hara <haraken@chromium.org>
+Cr-Commit-Position: refs/heads/master@{#672629}
+
+diff --git a/third_party/blink/renderer/modules/media_controls/elements/media_control_slider_element.cc b/third_party/blink/renderer/modules/media_controls/elements/media_control_slider_element.cc
+index e1f55e00cafbfbca376092e8e332ca68f14954b7..15ab3cbe33da36dffb1ee1cda4031a020362eef0 100644
+--- a/third_party/blink/renderer/modules/media_controls/elements/media_control_slider_element.cc
++++ b/third_party/blink/renderer/modules/media_controls/elements/media_control_slider_element.cc
+@@ -91,7 +91,7 @@ MediaControlSliderElement::MediaControlSliderElement(
+           new MediaControlSliderElementResizeObserverDelegate(this))) {
+   setType(InputTypeNames::range);
+   setAttribute(HTMLNames::stepAttr, "any");
+-  resize_observer_->observe(this);
++  OnControlsShown();
+ }
+ 
+ Element& MediaControlSliderElement::GetTrackElement() {
+@@ -172,4 +172,12 @@ void MediaControlSliderElement::Trace(blink::Visitor* visitor) {
+   MediaControlInputElement::Trace(visitor);
+ }
+ 
++void MediaControlSliderElement::OnControlsShown() {
++  resize_observer_->observe(this);
++}
++
++void MediaControlSliderElement::OnControlsHidden() {
++  resize_observer_->disconnect();
++}
++
+ }  // namespace blink
+diff --git a/third_party/blink/renderer/modules/media_controls/elements/media_control_slider_element.h b/third_party/blink/renderer/modules/media_controls/elements/media_control_slider_element.h
+index 8f5a631fa87e5f6ce9c94f8f8eefcd4152df1c1f..228886cfb1f1bbb244350e9c52f247bf41d6dbfc 100644
+--- a/third_party/blink/renderer/modules/media_controls/elements/media_control_slider_element.h
++++ b/third_party/blink/renderer/modules/media_controls/elements/media_control_slider_element.h
+@@ -33,6 +33,9 @@ class MODULES_EXPORT MediaControlSliderElement
+   // simplicity; deliberately ignores pinch zoom's pageScaleFactor).
+   int TrackWidth();
+ 
++  void OnControlsShown();
++  void OnControlsHidden();
++
+  protected:
+   class MediaControlSliderElementResizeObserverDelegate;
+ 
+diff --git a/third_party/blink/renderer/modules/media_controls/elements/media_control_timeline_element.cc b/third_party/blink/renderer/modules/media_controls/elements/media_control_timeline_element.cc
+index 62ef007e5f6d5bbe3cae8ab7760251256ce57efb..4022da87d0ad39e34f05423990a9df598955ed50 100644
+--- a/third_party/blink/renderer/modules/media_controls/elements/media_control_timeline_element.cc
++++ b/third_party/blink/renderer/modules/media_controls/elements/media_control_timeline_element.cc
+@@ -272,10 +272,12 @@ void MediaControlTimelineElement::OnControlsHidden() {
+ 
+   // End scrubbing state.
+   is_touching_ = false;
++  MediaControlSliderElement::OnControlsHidden();
+ }
+ 
+ void MediaControlTimelineElement::OnControlsShown() {
+   controls_hidden_ = false;
++  MediaControlSliderElement::OnControlsShown();
+ }
+ 
+ bool MediaControlTimelineElement::EndScrubbingEvent(Event& event) {
+diff --git a/third_party/blink/renderer/modules/media_controls/media_controls_impl.cc b/third_party/blink/renderer/modules/media_controls/media_controls_impl.cc
+index 5ca3a5f8314bc67d498b3c1d8306f550223781d3..37321c8331d80899afa632327540fd2199fc0907 100644
+--- a/third_party/blink/renderer/modules/media_controls/media_controls_impl.cc
++++ b/third_party/blink/renderer/modules/media_controls/media_controls_impl.cc
+@@ -911,6 +911,8 @@ void MediaControlsImpl::MaybeShow() {
+     loading_panel_->OnControlsShown();
+ 
+   timeline_->OnControlsShown();
++  if (volume_slider_)
++    volume_slider_->OnControlsShown();
+   UpdateCSSClassFromState();
+   UpdateActingAsAudioControls();
+ }
+@@ -936,6 +938,8 @@ void MediaControlsImpl::Hide() {
+     EndScrubbing();
+   }
+   timeline_->OnControlsHidden();
++  if (volume_slider_)
++    volume_slider_->OnControlsHidden();
+ 
+   UpdateCSSClassFromState();
+ 
+diff --git a/third_party/blink/renderer/modules/media_controls/media_controls_impl_test.cc b/third_party/blink/renderer/modules/media_controls/media_controls_impl_test.cc
+index 4bd7baed6c95deccfea6ac1f7c8998ad64c64e05..15a786c21b7f84d12e5ac87705b8ff0f54127765 100644
+--- a/third_party/blink/renderer/modules/media_controls/media_controls_impl_test.cc
++++ b/third_party/blink/renderer/modules/media_controls/media_controls_impl_test.cc
+@@ -14,10 +14,12 @@
+ #include "third_party/blink/public/platform/web_mouse_event.h"
+ #include "third_party/blink/public/platform/web_screen_info.h"
+ #include "third_party/blink/public/platform/web_size.h"
++#include "third_party/blink/renderer/bindings/core/v8/v8_gc_controller.h"
+ #include "third_party/blink/renderer/core/css/css_property_value_set.h"
+ #include "third_party/blink/renderer/core/css/document_style_environment_variables.h"
+ #include "third_party/blink/renderer/core/css/style_engine.h"
+ #include "third_party/blink/renderer/core/dom/document.h"
++#include "third_party/blink/renderer/core/dom/document_parser.h"
+ #include "third_party/blink/renderer/core/dom/element_traversal.h"
+ #include "third_party/blink/renderer/core/dom/events/event.h"
+ #include "third_party/blink/renderer/core/dom/text.h"
+@@ -1159,6 +1161,33 @@ TEST_F(MediaControlsImplTest,
+   EXPECT_EQ(nullptr, weak_persistent_video);
+ }
+ 
++TEST_F(MediaControlsImplTest,
++       RemovingFromDocumentWhenResettingSrcAllowsReclamation) {
++  // Regression test: https://crbug.com/918064
++  //
++  // Test ensures that unified heap garbage collections are able to collect
++  // detached HTMLVideoElements. The tricky part is that ResizeObserver's are
++  // treated as roots as long as they have observations which prevent the video
++  // element from being collected.
++
++  auto page_holder = std::make_unique<DummyPageHolder>();
++  page_holder->GetDocument().write("<video controls>");
++  page_holder->GetDocument().Parser()->Finish();
++
++  HTMLVideoElement& video =
++      ToHTMLVideoElement(*page_holder->GetDocument().QuerySelector("video"));
++  WeakPersistent<HTMLMediaElement> weak_persistent_video = &video;
++  video.remove();
++
++  test::RunPendingTasks();
++
++  // Needs to call into V8's GC here to trigger a unified garbage collection.
++  V8GCController::CollectAllGarbageForTesting(
++      ThreadState::Current()->GetIsolate(),
++      v8::EmbedderHeapTracer::EmbedderStackState::kEmpty);
++  EXPECT_EQ(nullptr, weak_persistent_video);
++}
++
+ TEST_F(MediaControlsImplTest,
+        ReInsertingInDocumentRestoresListenersAndCallbacks) {
+   auto page_holder = DummyPageHolder::Create();
diff --git a/patches/common/chromium/render_widget_host_view_mac.patch b/patches/common/chromium/render_widget_host_view_mac.patch
index 78998124eb60c..5d3b87d43d0e5 100644
--- a/patches/common/chromium/render_widget_host_view_mac.patch
+++ b/patches/common/chromium/render_widget_host_view_mac.patch
@@ -20,7 +20,7 @@ index 8b84322baa808f66044361d1033ec63805856227..70d244e01b75f98a6ed580475710d740
  // These are not documented, so use only after checking -respondsToSelector:.
  @interface NSApplication (UndocumentedSpeechMethods)
  - (void)speakString:(NSString*)string;
-@@ -354,6 +359,9 @@ void ExtractUnderlines(NSAttributedString* string,
+@@ -354,6 +359,9 @@ - (BOOL)acceptsMouseEventsWhenInactive {
  }
  
  - (BOOL)acceptsFirstMouse:(NSEvent*)theEvent {
@@ -30,7 +30,7 @@ index 8b84322baa808f66044361d1033ec63805856227..70d244e01b75f98a6ed580475710d740
    return [self acceptsMouseEventsWhenInactive];
  }
  
-@@ -688,6 +696,10 @@ void ExtractUnderlines(NSAttributedString* string,
+@@ -688,6 +696,10 @@ - (void)keyEvent:(NSEvent*)theEvent wasKeyEquivalent:(BOOL)equiv {
                                eventType == NSKeyDown &&
                                !(modifierFlags & NSCommandKeyMask);
  
@@ -41,7 +41,7 @@ index 8b84322baa808f66044361d1033ec63805856227..70d244e01b75f98a6ed580475710d740
    // We only handle key down events and just simply forward other events.
    if (eventType != NSKeyDown) {
      localClient_->ForwardKeyboardEvent(event, latency_info);
-@@ -1460,9 +1472,11 @@ void ExtractUnderlines(NSAttributedString* string,
+@@ -1460,9 +1472,11 @@ - (id)accessibilityFocusedUIElement {
  // Since this implementation doesn't have to wait any IPC calls, this doesn't
  // make any key-typing jank. --hbono 7/23/09
  //
@@ -53,7 +53,7 @@ index 8b84322baa808f66044361d1033ec63805856227..70d244e01b75f98a6ed580475710d740
  
  - (NSArray*)validAttributesForMarkedText {
    // This code is just copied from WebKit except renaming variables.
-@@ -1471,7 +1485,10 @@ extern NSString* NSTextInputReplacementRangeAttributeName;
+@@ -1471,7 +1485,10 @@ - (NSArray*)validAttributesForMarkedText {
          initWithObjects:NSUnderlineStyleAttributeName,
                          NSUnderlineColorAttributeName,
                          NSMarkedClauseSegmentAttributeName,
diff --git a/patches/common/chromium/tabbed_window_lagging.patch b/patches/common/chromium/tabbed_window_lagging.patch
index ddb29ec569366..67aae9258996c 100644
--- a/patches/common/chromium/tabbed_window_lagging.patch
+++ b/patches/common/chromium/tabbed_window_lagging.patch
@@ -15,7 +15,7 @@ diff --git a/ui/views/cocoa/bridged_native_widget.mm b/ui/views/cocoa/bridged_na
 index 8841b59f6b70ac4687adfde61a1fba1424e57e48..cc3659319c4076043a0493798db3c7b8a4afd21e 100644
 --- a/ui/views/cocoa/bridged_native_widget.mm
 +++ b/ui/views/cocoa/bridged_native_widget.mm
-@@ -1039,6 +1039,12 @@ bool BridgedNativeWidget::ShouldRunCustomAnimationFor(
+@@ -1039,6 +1039,12 @@ NSUInteger CountBridgedWindows(NSArray* child_windows) {
  // BridgedNativeWidget, ui::CATransactionObserver
  
  bool BridgedNativeWidget::ShouldWaitInPreCommit() {
diff --git a/patches/common/chromium/webview_cross_drag.patch b/patches/common/chromium/webview_cross_drag.patch
index 2594a6d429b16..762e30a083c32 100644
--- a/patches/common/chromium/webview_cross_drag.patch
+++ b/patches/common/chromium/webview_cross_drag.patch
@@ -20,7 +20,7 @@ diff --git a/content/browser/web_contents/web_drag_dest_mac.mm b/content/browser
 index cec3bd8a97b8b9bcab176a9bd2c296ec12aba838..7a2b4462bd44176e8e8389499f8c3d5fea647fa0 100644
 --- a/content/browser/web_contents/web_drag_dest_mac.mm
 +++ b/content/browser/web_contents/web_drag_dest_mac.mm
-@@ -348,6 +348,7 @@ GetRenderWidgetHostAtPoint:(const NSPoint&)viewPoint
+@@ -348,6 +348,7 @@ - (void)setDragStartTrackersForProcess:(int)processID {
  }
  
  - (bool)isValidDragTarget:(content::RenderWidgetHostImpl*)targetRWH {