backport: refactor text-to-speech to 4-0-x

atom/browser/atom_browser_client.cc

@@ -90,6 +90,10 @@
 #include "components/services/pdf_compositor/public/interfaces/pdf_compositor.mojom.h"
 #endif  // BUILDFLAG(ENABLE_PRINTING)
 
+#if BUILDFLAG(ENABLE_TTS)
+#include "chrome/browser/speech/tts_message_filter.h"
+#endif  // BUILDFLAG(ENABLE_TTS)
+
 using content::BrowserThread;
 
 namespace atom {
@@ -222,6 +226,10 @@ void AtomBrowserClient::RenderProcessWillLaunch(
       process_id, host->GetBrowserContext()));
 #endif
 
+#if BUILDFLAG(ENABLE_TTS)
+  host->AddFilter(new TtsMessageFilter(host->GetBrowserContext()));
+#endif
+
   ProcessPreferences prefs;
   auto* web_preferences =
       WebContentsPreferences::From(GetWebContentsFromProcessID(process_id));

atom/common/api/features.cc

@@ -39,6 +39,10 @@ bool IsPrintingEnabled() {
   return BUILDFLAG(ENABLE_PRINTING);
 }
 
+bool IsTtsEnabled() {
+  return BUILDFLAG(ENABLE_TTS);
+}
+
 void Initialize(v8::Local<v8::Object> exports,
                 v8::Local<v8::Value> unused,
                 v8::Local<v8::Context> context,
@@ -52,6 +56,7 @@ void Initialize(v8::Local<v8::Object> exports,
                  &IsFakeLocationProviderEnabled);
   dict.SetMethod("isViewApiEnabled", &IsViewApiEnabled);
   dict.SetMethod("isPrintingEnabled", &IsPrintingEnabled);
+  dict.SetMethod("isTtsEnabled", &IsTtsEnabled);
 }
 
 }  // namespace

atom/renderer/renderer_client_base.cc

@@ -19,7 +19,6 @@
 #include "base/command_line.h"
 #include "base/strings/string_split.h"
 #include "base/strings/stringprintf.h"
-#include "chrome/renderer/tts_dispatcher.h"
 #include "content/public/common/content_constants.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/renderer/render_frame.h"
@@ -56,6 +55,10 @@
 #include "components/printing/renderer/print_render_frame_helper.h"
 #endif  // BUILDFLAG(ENABLE_PRINTING)
 
+#if BUILDFLAG(ENABLE_TTS)
+#include "chrome/renderer/tts_dispatcher.h"
+#endif  // BUILDFLAG(ENABLE_TTS)
+
 namespace atom {
 
 namespace {
@@ -228,7 +231,11 @@ void RendererClientBase::DidClearWindowObject(
 std::unique_ptr<blink::WebSpeechSynthesizer>
 RendererClientBase::OverrideSpeechSynthesizer(
     blink::WebSpeechSynthesizerClient* client) {
+#if BUILDFLAG(ENABLE_TTS)
   return std::make_unique<TtsDispatcher>(client);
+#else
+  return nullptr;
+#endif
 }
 
 bool RendererClientBase::OverrideCreatePlugin(

buildflags/BUILD.gn

@@ -15,6 +15,7 @@ buildflag_header("buildflags") {
     "ENABLE_VIEW_API=$enable_view_api",
     "ENABLE_PEPPER_FLASH=$enable_pepper_flash",
     "ENABLE_PDF_VIEWER=$enable_pdf_viewer",
+    "ENABLE_TTS=$enable_tts",
     "OVERRIDE_LOCATION_PROVIDER=$enable_fake_location_provider",
   ]
 }

buildflags/buildflags.gni

@@ -14,6 +14,8 @@ declare_args() {
 
   enable_pdf_viewer = false
 
+  enable_tts = true
+
   # Provide a fake location provider for mocking
   # the geolocation responses. Disable it if you
   # need to test with chromium's location provider.

chromium_src/BUILD.gn

@@ -99,4 +99,28 @@ source_set("chrome") {
       ]
     }
   }
+
+  if (enable_tts) {
+    sources += [
+      "//chrome/browser/speech/tts_controller.h",
+      "//chrome/browser/speech/tts_controller_impl.cc",
+      "//chrome/browser/speech/tts_controller_impl.h",
+      "//chrome/browser/speech/tts_mac.mm",
+      "//chrome/browser/speech/tts_message_filter.cc",
+      "//chrome/browser/speech/tts_message_filter.h",
+      "//chrome/browser/speech/tts_platform.cc",
+      "//chrome/browser/speech/tts_platform.h",
+      "//chrome/browser/speech/tts_win.cc",
+      "//chrome/common/tts_messages.h",
+      "//chrome/common/tts_utterance_request.cc",
+      "//chrome/common/tts_utterance_request.h",
+      "//chrome/renderer/tts_dispatcher.cc",
+      "//chrome/renderer/tts_dispatcher.h",
+    ]
+
+    if (is_linux) {
+      sources += [ "//chrome/browser/speech/tts_linux.cc" ]
+      deps += [ "//third_party/speech-dispatcher" ]
+    }
+  }
 }