Use tiles when encoding with VP9.

remoting/codec/video_encoder_vpx.cc

 // 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.
 
 #include "remoting/codec/video_encoder_vpx.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/sys_info.h"
@@ skipping 115 matching lines @@
 
   // Use the lowest level of noise sensitivity so as to spend less time
   // on motion estimation and inter-prediction mode.
   ret = vpx_codec_control(codec, VP9E_SET_NOISE_SENSITIVITY, 0);
   DCHECK_EQ(VPX_CODEC_OK, ret) << "Failed to set noise sensitivity";
 
   // Configure the codec to tune it for screen media.
   ret = vpx_codec_control(
       codec, VP9E_SET_TUNE_CONTENT, VP9E_CONTENT_SCREEN);
   DCHECK_EQ(VPX_CODEC_OK, ret) << "Failed to set screen content mode";
+
+  // VP9 tiles allow for parallelism on both encode and decode
+  ret = vpx_codec_control(codec, VP9E_SET_TILE_COLUMNS, 1);
+  DCHECK_EQ(VPX_CODEC_OK, ret) << "Failed to set tile columns";
 }
 
 void CreateImage(bool use_i444,
                  const webrtc::DesktopSize& size,
                  scoped_ptr<vpx_image_t>* out_image,
                  scoped_ptr<uint8[]>* out_image_buffer) {
   DCHECK(!size.is_empty());
 
   scoped_ptr<vpx_image_t> image(new vpx_image_t());
   memset(image.get(), 0, sizeof(vpx_image_t));
@@ skipping 327 matching lines @@
     uint8* map = active_map_.get() + top * active_map_width_;
     for (int y = top; y <= bottom; ++y) {
       for (int x = left; x <= right; ++x)
         map[x] = 1;
       map += active_map_width_;
     }
   }
 }
 
 }  // namespace remoting