Enable adaptive playback for spitzer, use conservative size.

media/video/video_decode_accelerator.h

 // Copyright (c) 2012 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 MEDIA_VIDEO_VIDEO_DECODE_ACCELERATOR_H_
 #define MEDIA_VIDEO_VIDEO_DECODE_ACCELERATOR_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 104 matching lines @@
     bool is_encrypted = false;
 
     // The flag indicating whether the client supports deferred initialization
     // or not.
     bool is_deferred_initialization_allowed = false;
 
     // An optional graphics surface that the VDA should render to. For setting
     // an output SurfaceView on Android. It's only valid when not equal to
     // |kNoSurfaceID|.
     int surface_id = kNoSurfaceID;
+
+    // Coded size of the video frame.

[DaleCurtis, 2016/04/07 18:41:25]

Ditto on adding a note, maybe even name it initial_expected_coded_size in all
cases. 

[liberato (no reviews please), 2016/04/07 20:46:29]

Done.

+    gfx::Size coded_size;
   };
 
   // Interface for collaborating with picture interface to provide memory for
   // output picture and blitting them. These callbacks will not be made unless
   // Initialize() has returned successfully.
   // This interface is extended by the various layers that relay messages back
   // to the plugin, through the PPP_VideoDecoder_Dev interface the plugin
   // implements.
   class MEDIA_EXPORT Client {
    public:
@@ skipping 169 matching lines @@
 // Specialize std::default_delete so that scoped_ptr<VideoDecodeAccelerator>
 // uses "Destroy()" instead of trying to use the destructor.
 template <>
 struct MEDIA_EXPORT default_delete<media::VideoDecodeAccelerator> {
   void operator()(media::VideoDecodeAccelerator* vda) const;
 };
 
 }  // namespace std
 
 #endif  // MEDIA_VIDEO_VIDEO_DECODE_ACCELERATOR_H_