Defer media playback in background tabs.

content/renderer/render_frame_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 #define CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 948 matching lines @@
 
   // The CDM factory attached to this frame, lazily initialized.
   scoped_ptr<media::CdmFactory> cdm_factory_;
 
 #if defined(VIDEO_HOLE)
   // Whether or not this RenderFrameImpl contains a media player. Used to
   // register as an observer for video-hole-specific events.
   bool contains_media_player_;
 #endif
 
+  // True if this RenderFrame has ever played media.
+  bool has_played_media_;
+
   // The devtools agent for this frame; only created for main frame and
   // local roots.
   DevToolsAgent* devtools_agent_;
 
   // The geolocation dispatcher attached to this frame, lazily initialized.
   GeolocationDispatcher* geolocation_dispatcher_;
 
   // The push messaging dispatcher attached to this frame, lazily initialized.
   PushMessagingDispatcher* push_messaging_dispatcher_;
 
@@ skipping 35 matching lines @@
 #endif
 
   base::WeakPtrFactory<RenderFrameImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_FRAME_IMPL_H_