Enable Cyclic Refresh for VP9.

remoting/codec/video_encoder_vpx.h

 // Copyright 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.
 
 #ifndef REMOTING_CODEC_VIDEO_ENCODER_VPX_H_
 #define REMOTING_CODEC_VIDEO_ENCODER_VPX_H_
 
 #include "base/callback.h"
 #include "base/time/time.h"
 #include "remoting/codec/scoped_vpx_codec.h"
@@ skipping 31 matching lines @@
 
   // Prepares |image_| for encoding. Writes updated rectangles into
   // |updated_region|.
   void PrepareImage(const webrtc::DesktopFrame& frame,
                     webrtc::DesktopRegion* updated_region);
 
   // Updates the active map according to |updated_region|. Active map is then
   // given to the encoder to speed up encoding.
   void PrepareActiveMap(const webrtc::DesktopRegion& updated_region);
 
+  // Updates the active map to revealing areas updated by cyclic refresh.

[Wez, 2015/04/18 00:17:55]

This doesn't seem to update the active map at all; it fetches the active map
that the encoder actually used for the frame, combining the caller-supplied
active map with the areas updated by cyclic refresh, right?

Suggest changing PrepareActiveMap() and UpdateActiveMap() to
SetActiveMap[FromRegion](...) and GetActiveMap[ToRegion](...). The *Region forms
seem clearer to read, but more verbose, so up to you.

[aconverse, 2015/04/20 18:32:39]

Done.

+  void UpdateActiveMap(webrtc::DesktopRegion* updated_region);
+
   // True if the encoder is for VP9, false for VP8.
   const bool use_vp9_;
 
   // Options controlling VP9 encode quantization and color space.
   // These are always off (false) for VP8.
   bool lossless_encode_;
   bool lossless_color_;
 
   // Holds the initialized & configured codec.
   ScopedVpxCodec codec_;
@@ skipping 12 matching lines @@
 
   // Used to help initialize VideoPackets from DesktopFrames.
   VideoEncoderHelper helper_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoEncoderVpx);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CODEC_VIDEO_ENCODER_VP8_H_