Let Contraints Controll Mute/Unmute Audio Local Playback For Desktop Sharing

content/browser/renderer_host/media/media_stream_manager.h

Index: content/browser/renderer_host/media/media_stream_manager.h
diff --git a/content/browser/renderer_host/media/media_stream_manager.h b/content/browser/renderer_host/media/media_stream_manager.h
index 28fb10286c3f1edddf40caf2ebc17079e5e1f17c..c448eafbf606d5cc7db502f3681dcc775c0fa424 100644
--- a/content/browser/renderer_host/media/media_stream_manager.h
+++ b/content/browser/renderer_host/media/media_stream_manager.h
@@ -78,6 +78,10 @@ class CONTENT_EXPORT MediaStreamManager
                               std::unique_ptr<MediaStreamUIProxy> ui)>
       MediaRequestResponseCallback;
 
+  // Callback for testing.
+  typedef base::Callback<bool(const StreamControls&)>
+      GenerateStreamTestCallback;
+
   // Adds |message| to native logs for outstanding device requests, for use by
   // render processes hosts whose corresponding render processes are requesting
   // logging from webrtcLoggingPrivate API. Safe to call from any thread.
@@ -274,6 +278,9 @@ class CONTENT_EXPORT MediaStreamManager
   // See http://crbug.com/648183.
   void NotifyDeviceChangeSubscribers(MediaStreamType type);
 
+  void SetGenerateStreamCallbackForTesting(
+      GenerateStreamTestCallback test_callback);
+
  private:
   // Contains all data needed to keep track of requests.
   class DeviceRequest;
@@ -450,6 +457,8 @@ class CONTENT_EXPORT MediaStreamManager
   // Objects subscribed to changes in the set of media devices.
   std::vector<MediaStreamRequester*> device_change_subscribers_;
 
+  GenerateStreamTestCallback generate_stream_test_callback_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaStreamManager);
 };