Add VP9 decode support to the remoting client.

remoting/codec/video_encoder_vpx.cc

Index: remoting/codec/video_encoder_vpx.cc
diff --git a/remoting/codec/video_encoder_vpx.cc b/remoting/codec/video_encoder_vpx.cc
index c9194024cf7253ce3ccc381bb9041bd1345f5585..9259ea706f38ccf6943d4a19cb70e861c209e9fc 100644
--- a/remoting/codec/video_encoder_vpx.cc
+++ b/remoting/codec/video_encoder_vpx.cc
@@ -197,6 +197,10 @@ bool VideoEncoderVpx::Initialize(const webrtc::DesktopSize& size) {
   image_->d_h = size.height();
   image_->h = size.height();
 
+  // libvpx should derive this from|fmt| but currently has a bug.
+  image_->x_chroma_shift = 1;
+  image_->y_chroma_shift = 1;

[Jamie, 2013/10/21 18:28:20]

Does this bug only affect VP9? If not, then this should be a separate CL.

[Wez, 2013/10/22 01:13:01]

We only need to set this due to a bug in libvpx. It appears only to affect VP9
(otherwise we'd already be broken), presumably because VP8 only supports I420.

+
   // Initialize active map.
   active_map_width_ = (image_->w + kMacroBlockSize - 1) / kMacroBlockSize;
   active_map_height_ = (image_->h + kMacroBlockSize - 1) / kMacroBlockSize;