Add support for switching the audio output device for HTMLMediaElements.

content/renderer/media/webmediaplayer_ms.h

Index: content/renderer/media/webmediaplayer_ms.h
diff --git a/content/renderer/media/webmediaplayer_ms.h b/content/renderer/media/webmediaplayer_ms.h
index 7310fd63570390af7a77f760e627da6fa3674096..291091eefc90450cc143e3e6f8d81cbd5e2af07d 100644
--- a/content/renderer/media/webmediaplayer_ms.h
+++ b/content/renderer/media/webmediaplayer_ms.h
@@ -14,6 +14,7 @@
 #include "media/blink/skcanvas_video_renderer.h"
 #include "skia/ext/platform_canvas.h"
 #include "third_party/WebKit/public/platform/WebMediaPlayer.h"
+#include "third_party/WebKit/public/platform/WebSetAudioOutputDeviceRequest.h"
 #include "url/gurl.h"
 
 namespace blink {
@@ -75,6 +76,8 @@ class WebMediaPlayerMS
   virtual void seek(double seconds);
   virtual void setRate(double rate);
   virtual void setVolume(double volume);
+  virtual void setAudioOutputDevice(
+      const blink::WebSetAudioOutputDeviceRequest& request);
   virtual void setPreload(blink::WebMediaPlayer::Preload preload);
   virtual blink::WebTimeRanges buffered() const;
   virtual blink::WebTimeRanges seekable() const;
@@ -156,7 +159,16 @@ class WebMediaPlayerMS
   // Getter method to |client_|.
   blink::WebMediaPlayerClient* GetClient();
 
-  blink::WebFrame* frame_;
+  static void PrepareFinishSetAudioOutputRequest(
+      WebMediaPlayerMS* media_player,
+      const scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+      blink::WebSetAudioOutputDeviceRequest* request,
+      int result);
+  void FinishSetAudioOutputRequest(
+        blink::WebSetAudioOutputDeviceRequest *request,
+        int result);
+
+    blink::WebFrame* frame_;
 
   blink::WebMediaPlayer::NetworkState network_state_;
   blink::WebMediaPlayer::ReadyState ready_state_;
@@ -165,8 +177,9 @@ class WebMediaPlayerMS
 
   float volume_;
 
-  // Used for DCHECKs to ensure methods calls executed in the correct thread.
-  base::ThreadChecker thread_checker_;
+  // Task runner for posting tasks on Chrome's main thread. Also used
+  // for DCHECKs so methods calls won't execute in the wrong thread.
+  const scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
 
   blink::WebMediaPlayerClient* client_;