feat: support exclude from capture on Windows (#24274)

* feat: support exclude from capture on Windows

Check for WDA_EXCLUDEFROMCAPTURE support, and fallback to WDA_MONITOR. Windows versions that support exclude from capture will exclude the window entirely when `setContentProtection` is enabled similar to how Mac behaves. Fall back to `WDA_MONITOR` for windows verisions that do not support.

This flag is mentioned at the very end of a Microsoft blog post here: https://blogs.windows.com/windowsdeveloper/2019/09/16/new-ways-to-do-screen-capture/
Use WDA_EXCLUDEFROMCAPTURE for content protection on windows

Starting with Windows 10, version 2004 this will exclude a window similar to the expected behavior on mac. It is safe to use WDA_EXCLUDEFROMCAPTURE on older Windows versions, as it will still behave as if WDA_MONITOR is applied.
microsoft/Windows.UI.Composition-Win32-Samples#64 (comment)

See the docs here: https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-setwindowdisplayaffinity

* docs: update setContentProtection docs

Update `setContentProtection` docs with `WDA_EXCLUDEFROMCAPTURE` info. This is to support screen capture fully excluding a particular window instead of showing it as a black screen.

docs/api/browser-window.md

@@ -1734,7 +1734,9 @@ events.
 Prevents the window contents from being captured by other apps.
 
 On macOS it sets the NSWindow's sharingType to NSWindowSharingNone.
-On Windows it calls SetWindowDisplayAffinity with `WDA_MONITOR`.
+On Windows it calls SetWindowDisplayAffinity with `WDA_EXCLUDEFROMCAPTURE`.
+For Windows 10 version 2004 and up the window will be removed from capture entirely,
+older Windows versions behave as if `WDA_MONITOR` is applied capturing a black window.
 
 #### `win.setFocusable(focusable)` _macOS_ _Windows_
 

shell/browser/native_window_views.cc

@@ -1003,7 +1003,7 @@ void NativeWindowViews::SetIgnoreMouseEvents(bool ignore, bool forward) {
 
 void NativeWindowViews::SetContentProtection(bool enable) {
 #if defined(OS_WIN)
-  DWORD affinity = enable ? WDA_MONITOR : WDA_NONE;
+  DWORD affinity = enable ? WDA_EXCLUDEFROMCAPTURE : WDA_NONE;
   ::SetWindowDisplayAffinity(GetAcceleratedWidget(), affinity);
 #endif
 }