[Cast] Software encoder support for varying video frame sizes.

media/cast/sender/external_video_encoder.h

 // Copyright 2014 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_CAST_SENDER_EXTERNAL_VIDEO_ENCODER_H_
 #define MEDIA_CAST_SENDER_EXTERNAL_VIDEO_ENCODER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "media/cast/cast_config.h"
@@ skipping 14 matching lines @@
       const scoped_refptr<CastEnvironment>& cast_environment,
       const VideoSenderConfig& video_config,
       const gfx::Size& frame_size,
       const CastInitializationCallback& initialization_cb,
       const CreateVideoEncodeAcceleratorCallback& create_vea_cb,
       const CreateVideoEncodeMemoryCallback& create_video_encode_memory_cb);
 
   ~ExternalVideoEncoder() override;
 
   // VideoEncoder implementation.
+  bool CanEncodeVariedFrameSizes() const override;
   bool EncodeVideoFrame(
       const scoped_refptr<media::VideoFrame>& video_frame,
       const base::TimeTicks& reference_time,
       const FrameEncodedCallback& frame_encoded_callback) override;
   void SetBitRate(int new_bit_rate) override;
   void GenerateKeyFrame() override;
   void LatestFrameIdToReference(uint32 frame_id) override;
 
  private:
   class VEAClientImpl;
@@ skipping 20 matching lines @@
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<ExternalVideoEncoder> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExternalVideoEncoder);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_SENDER_EXTERNAL_VIDEO_ENCODER_H_