WebContentsAudioMuter: Mute all audio output from a WebContentsImpl.

content/browser/web_contents/web_contents_impl.h

Index: content/browser/web_contents/web_contents_impl.h
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index 134b8d8860b4d24bf5cf734fb16ecbec2f22636b..aef37e85a4e1864e756b555fdcdb6d37f6aaba79 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -67,6 +67,7 @@ class SiteInstance;
 class TestWebContents;
 class WebContentsDelegate;
 class WebContentsImpl;
+class WebContentsAudioMuter;

[Avi (use Gerrit), 2014/09/21 00:20:00]

alphabetical order

[miu, 2014/09/21 02:33:30]

Done.  (I had renamed the class while working the code, but forgot to change the
ordering here.)

 class WebContentsObserver;
 class WebContentsView;
 class WebContentsViewDelegate;
@@ -246,6 +247,8 @@ class CONTENT_EXPORT WebContentsImpl
   virtual void IncrementCapturerCount(const gfx::Size& capture_size) OVERRIDE;
   virtual void DecrementCapturerCount() OVERRIDE;
   virtual int GetCapturerCount() const OVERRIDE;
+  virtual bool IsAudioMuted() const OVERRIDE;
+  virtual void ToggleAudioMute(bool mute) OVERRIDE;
   virtual bool IsCrashed() const OVERRIDE;
   virtual void SetIsCrashed(base::TerminationStatus status,
                             int error_code) OVERRIDE;
@@ -1241,6 +1244,9 @@ class CONTENT_EXPORT WebContentsImpl
   // Monitors power levels for audio streams associated with this WebContents.
   AudioStreamMonitor audio_stream_monitor_;
 
+  // Created on-demand to mute all audio output from this WebContents.
+  scoped_ptr<WebContentsAudioMuter> audio_muter_;
+
   base::WeakPtrFactory<WebContentsImpl> loading_weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsImpl);