Allow shaped-desktop hosts to send shape only when it changes.

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/logging.h"
 #include "base/sys_info.h"
 #include "remoting/base/util.h"
@@ skipping 307 matching lines @@
 
   if (use_vp9_ && !lossless_encode_) {
     ret = vpx_codec_control(codec_.get(), VP9E_GET_ACTIVEMAP, &act_map);
     DCHECK_EQ(ret, VPX_CODEC_OK)
         << "Failed to fetch active map: "
         << vpx_codec_err_to_string(ret) << "\n";
     UpdateRegionFromActiveMap(&updated_region);
   }
 
   // Read the encoded data.
-  vpx_codec_iter_t iter = NULL;
+  vpx_codec_iter_t iter = nullptr;
   bool got_data = false;
 
   // TODO(hclam): Make sure we get exactly one frame from the packet.
   // TODO(hclam): We should provide the output buffer to avoid one copy.
   scoped_ptr<VideoPacket> packet(
       helper_.CreateVideoPacketWithUpdatedRegion(frame, updated_region));
   packet->mutable_format()->set_encoding(VideoPacketFormat::ENCODING_VP8);
 
   while (!got_data) {
     const vpx_codec_cx_pkt_t* vpx_packet =
@@ skipping 206 matching lines @@
             kMacroBlockSize * (y + 1)));
       }
       x0 = x1 + 1;
     }
   }
   updated_region->IntersectWith(
       webrtc::DesktopRect::MakeWH(image_->w, image_->h));
 }
 
 }  // namespace remoting