Enable audio/video tag in content_shell

content/browser/renderer_host/media/audio_renderer_host.cc

Index: content/browser/renderer_host/media/audio_renderer_host.cc
diff --git a/content/browser/renderer_host/media/audio_renderer_host.cc b/content/browser/renderer_host/media/audio_renderer_host.cc
index 2b6815a71774626ec7ee37415812f0c5b15e2756..fcb29404b64950aa81716f4e03cafc4ee87817cf 100644
--- a/content/browser/renderer_host/media/audio_renderer_host.cc
+++ b/content/browser/renderer_host/media/audio_renderer_host.cc
@@ -238,7 +238,7 @@ void AudioRendererHost::OnCreateStream(
   // to the map.
   entry->stream_id = stream_id;
   audio_entries_.insert(std::make_pair(stream_id, entry.release()));
-  GetMediaObserver()->OnSetAudioStreamStatus(this, stream_id, "created");
+  OnSetAudioStreamStatus(stream_id, "created");
 }
 
 void AudioRendererHost::OnPlayStream(int stream_id) {
@@ -251,7 +251,7 @@ void AudioRendererHost::OnPlayStream(int stream_id) {
   }
 
   entry->controller->Play();
-  GetMediaObserver()->OnSetAudioStreamPlaying(this, stream_id, true);
+  OnSetAudioStreamPlaying(stream_id, true);
 }
 
 void AudioRendererHost::OnPauseStream(int stream_id) {
@@ -264,7 +264,7 @@ void AudioRendererHost::OnPauseStream(int stream_id) {
   }
 
   entry->controller->Pause();
-  GetMediaObserver()->OnSetAudioStreamPlaying(this, stream_id, false);
+  OnSetAudioStreamPlaying(stream_id, false);
 }
 
 void AudioRendererHost::OnFlushStream(int stream_id) {
@@ -277,13 +277,13 @@ void AudioRendererHost::OnFlushStream(int stream_id) {
   }
 
   entry->controller->Flush();
-  GetMediaObserver()->OnSetAudioStreamStatus(this, stream_id, "flushed");
+  OnSetAudioStreamStatus(stream_id, "flushed");
 }
 
 void AudioRendererHost::OnCloseStream(int stream_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
-  GetMediaObserver()->OnSetAudioStreamStatus(this, stream_id, "closed");
+  OnSetAudioStreamStatus(stream_id, "closed");
 
   AudioEntry* entry = LookupById(stream_id);
 
@@ -304,7 +304,7 @@ void AudioRendererHost::OnSetVolume(int stream_id, double volume) {
   if (volume < 0 || volume > 1.0)
     return;
   entry->controller->SetVolume(volume);
-  GetMediaObserver()->OnSetAudioStreamVolume(this, stream_id, volume);
+  OnSetAudioStreamVolume(stream_id, volume);
 }
 
 void AudioRendererHost::SendErrorMessage(int32 stream_id) {
@@ -348,7 +348,7 @@ void AudioRendererHost::DeleteEntry(AudioEntry* entry) {
   audio_entries_.erase(entry->stream_id);
 
   // Notify the media observer.
-  GetMediaObserver()->OnDeleteAudioStream(this, entry->stream_id);
+  OnDeleteAudioStream(entry->stream_id);
 }
 
 void AudioRendererHost::DeleteEntryOnError(AudioEntry* entry) {
@@ -358,7 +358,7 @@ void AudioRendererHost::DeleteEntryOnError(AudioEntry* entry) {
   // |entry| is destroyed in DeleteEntry().
   SendErrorMessage(entry->stream_id);
 
-  GetMediaObserver()->OnSetAudioStreamStatus(this, entry->stream_id, "error");
+  OnSetAudioStreamStatus(entry->stream_id, "error");
   CloseAndDeleteStream(entry);
 }
 
@@ -385,6 +385,31 @@ AudioRendererHost::AudioEntry* AudioRendererHost::LookupByController(
   return NULL;
 }
 
+void AudioRendererHost::OnSetAudioStreamPlaying(int stream_id, bool playing) {
+  if (!GetMediaObserver())
+    return;
+  GetMediaObserver()->OnSetAudioStreamPlaying(this, stream_id, playing);
+}
+
+void AudioRendererHost::OnSetAudioStreamStatus(int stream_id,
+                                               const std::string& status) {
+  if (!GetMediaObserver())
+    return;
+  GetMediaObserver()->OnSetAudioStreamStatus(this, stream_id, status);
+}
+
+void AudioRendererHost::OnSetAudioStreamVolume(int stream_id, double volume) {
+  if (!GetMediaObserver())
+    return;
+  GetMediaObserver()->OnSetAudioStreamVolume(this, stream_id, volume);
+}
+
+void AudioRendererHost::OnDeleteAudioStream(int stream_id) {
+  if (!GetMediaObserver())
+    return;
+  GetMediaObserver()->OnDeleteAudioStream(this, stream_id);
+}
+
 content::MediaObserver* AudioRendererHost::GetMediaObserver() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   if (!media_observer_)