Add hints for potential overlay promotion on android.

media/gpu/android_video_decode_accelerator.cc

 // Copyright (c) 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.
 
 #include "media/gpu/android_video_decode_accelerator.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 723 matching lines @@
     NOTIFY_ERROR(PLATFORM_FAILURE,
                  "Can't find PictureBuffer id: " << picture_buffer_id);
     return;
   }
 
   PictureBuffer& picture_buffer = it->second;
   const bool size_changed = picture_buffer.size() != size_;
   if (size_changed)
     picture_buffer.set_size(size_);
 
+  // TODO(liberato): request a hint for promotability.  crbug.com/671365 .
   const bool allow_overlay = picture_buffer_manager_.ArePicturesOverlayable();
   UMA_HISTOGRAM_BOOLEAN("Media.AVDA.FrameSentAsOverlay", allow_overlay);
   // TODO(hubbe): Insert the correct color space. http://crbug.com/647725
   Picture picture(picture_buffer_id, bitstream_id, gfx::Rect(size_),
                   gfx::ColorSpace(), allow_overlay);
   picture.set_size_changed(size_changed);
 
   // Notify picture ready before calling UseCodecBufferForPictureBuffer() since
   // that process may be slow and shouldn't delay delivery of the frame to the
   // renderer. The picture is only used on the same thread as this method is
@@ skipping 756 matching lines @@
     AVDACodecAllocator::Instance()->DeallocateSurface(this, new_surface_id);
   }
 
   // Regardless of whether we succeeded, we no longer own the previous surface.
   AVDACodecAllocator::Instance()->DeallocateSurface(this, previous_surface_id);
 
   return success;
 }
 
 }  // namespace media