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 995 matching lines @@
 #if defined(ENABLE_WEBVR)
   // The VR dispatcher attached to the frame, lazily initialized.
   scoped_ptr<VRDispatcher> vr_dispatcher_;
 #endif
 
 #if defined(OS_MACOSX) || defined(OS_ANDROID)
   // The external popup for the currently showing select popup.
   scoped_ptr<ExternalPopupMenu> external_popup_menu_;
 #endif
 
+  // True if this RenderFrame has ever played media.
+  bool has_played_media_;

[Charlie Reis, 2015/08/18 17:30:03]

Is this something that can live in one of the various media-related classes
above, or does it really need to be on RenderFrame?  (If it does stay, we should
list it close to those members and not down here at the bottom.)

[DaleCurtis, 2015/08/18 18:19:12]

None of those are any better of a fit unfortunately, so I've just moved this
value up to the other media pieces. One day if we tease out
media::WebMediaPlayerDelegate from RenderFrameImpl it could be added there.

+
   base::WeakPtrFactory<RenderFrameImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_FRAME_IMPL_H_