[Cast] VideoFrameFactory interface to vend frames with encoder affinity.

media/cast/sender/video_encoder_impl.cc

 // 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.
 
 #include "media/cast/sender/video_encoder_impl.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "media/base/video_frame.h"
 #include "media/cast/cast_defines.h"
 #include "media/cast/sender/fake_software_video_encoder.h"
+#include "media/cast/sender/video_frame_factory.h"
 #include "media/cast/sender/vp8_encoder.h"
 
 namespace media {
 namespace cast {
 
 namespace {
 
 typedef base::Callback<void(Vp8Encoder*)> PassEncoderCallback;
 
 void InitializeEncoderOnEncoderThread(
@@ skipping 89 matching lines @@
 // Inform the encoder to encode the next frame as a key frame.
 void VideoEncoderImpl::GenerateKeyFrame() {
   dynamic_config_.key_frame_requested = true;
 }
 
 // Inform the encoder to only reference frames older or equal to frame_id;
 void VideoEncoderImpl::LatestFrameIdToReference(uint32 frame_id) {
   dynamic_config_.latest_frame_id_to_reference = frame_id;
 }
 
+// Creates a |VideoFrameFactory| object to vend |VideoFrame| object with
+// encoder affinity (defined as offering some sort of performance benefit). If
+// the encoder does not have any such capability, returns null.
+scoped_ptr<VideoFrameFactory> VideoEncoderImpl::CreateVideoFrameFactory() {
+  return nullptr;
+}
+
 }  //  namespace cast
 }  //  namespace media