Default VDA expected coded size to 320x240.

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 118 matching lines @@
     // 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 hint, subject to change.
-    gfx::Size initial_expected_coded_size;
+    gfx::Size initial_expected_coded_size = gfx::Size(320, 240);
 
     OutputMode output_mode = OutputMode::ALLOCATE;
   };
 
   // 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.
@@ skipping 188 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_