Add support for switching the audio output device for HTMLMediaElements.

media/blink/webmediaplayer_impl.h

Index: media/blink/webmediaplayer_impl.h
diff --git a/media/blink/webmediaplayer_impl.h b/media/blink/webmediaplayer_impl.h
index 427357b1f615fb8388c87522829dfb97085f8b09..282f7c08535e6821c4371e053cdc06f29555f6bd 100644
--- a/media/blink/webmediaplayer_impl.h
+++ b/media/blink/webmediaplayer_impl.h
@@ -29,6 +29,8 @@
 #include "third_party/WebKit/public/platform/WebContentDecryptionModuleResult.h"
 #include "third_party/WebKit/public/platform/WebMediaPlayer.h"
 #include "third_party/WebKit/public/platform/WebMediaPlayerClient.h"
+#include "third_party/WebKit/public/platform/WebSetAudioOutputDeviceRequest.h"
+#include "third_party/WebKit/public/platform/WebString.h"
 #include "url/gurl.h"
 
 namespace blink {
@@ -86,6 +88,8 @@ class MEDIA_EXPORT WebMediaPlayerImpl
   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;
@@ -236,6 +240,15 @@ class MEDIA_EXPORT WebMediaPlayerImpl
   // |ended_| state by clamping current time to duration upon |ended_|.
   void UpdatePausedTime();
 
+  static void PrepareFinishSetAudioOutputRequest(
+      WebMediaPlayerImpl* media_player,
+      const scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+      blink::WebSetAudioOutputDeviceRequest* request,
+      int result);
+  void FinishSetAudioOutputRequest(
+      blink::WebSetAudioOutputDeviceRequest* request,
+      int result);
+
   blink::WebLocalFrame* frame_;
 
   // TODO(hclam): get rid of these members and read from the pipeline directly.