content_browsertests will now use fake webrtc devices.

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 bb407cea0a373851c4a85a058f1fdd5b3730a0a1..9a8659682b52797824345b55bd6d35d681c4fcef 100644
--- a/content/browser/renderer_host/media/media_stream_manager.h
+++ b/content/browser/renderer_host/media/media_stream_manager.h
@@ -148,10 +148,12 @@ class CONTENT_EXPORT MediaStreamManager
 
   // Used by unit test to make sure fake devices are used instead of a real
   // devices, which is needed for server based testing.
-  // TODO(xians): Remove this hack since we can create our own
-  // MediaStreamManager in our unit tests.
   void UseFakeDevice();
 
+  // Call to have all GenerateStream calls from now on use fake devices instead
+  // of real ones. This should NOT be used in production versions of Chrome.
+  static void AlwaysUseFakeDevice();
+
   // This object gets deleted on the UI thread after the IO thread has been
   // destroyed. So we need to know when IO thread is being destroyed so that
   // we can delete VideoCaptureManager and AudioInputDeviceManager.
@@ -229,6 +231,9 @@ class CONTENT_EXPORT MediaStreamManager
   // managers on the right thread.
   MessageLoop* io_loop_;
 
+  // Static members.
+  static bool always_use_fake_devices_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaStreamManager);
 };