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

remoting/client/frame_consumer_proxy.cc

Index: remoting/client/frame_consumer_proxy.cc
diff --git a/remoting/client/frame_consumer_proxy.cc b/remoting/client/frame_consumer_proxy.cc
index bf70da533b8354e4619243d49fba84aaec13ddd6..21d03bfc663d3948e0cd40487a5077c9d2ff35db 100644
--- a/remoting/client/frame_consumer_proxy.cc
+++ b/remoting/client/frame_consumer_proxy.cc
@@ -7,6 +7,7 @@
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
+#include "base/thread_task_runner_handle.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_region.h"
@@ -14,51 +15,50 @@
 namespace remoting {
 
 FrameConsumerProxy::FrameConsumerProxy(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
     const base::WeakPtr<FrameConsumer>& frame_consumer)
     : frame_consumer_(frame_consumer),
-      task_runner_(task_runner) {
+      task_runner_(base::ThreadTaskRunnerHandle::Get()) {
   pixel_format_ = frame_consumer_->GetPixelFormat();
 }
 
+static void DoApplyBuffer(base::WeakPtr<FrameConsumer> frame_consumer,
+                          const webrtc::DesktopSize& view_size,
+                          const webrtc::DesktopRect& clip_area,
+                          webrtc::DesktopFrame* buffer,
+                          const webrtc::DesktopRegion& region,
+                          scoped_ptr<webrtc::DesktopRegion> shape) {
+  if (!frame_consumer)
+    return;
+
+  frame_consumer->ApplyBuffer(view_size, clip_area, buffer, region,
+                              shape.get());
+}
+
 void FrameConsumerProxy::ApplyBuffer(const webrtc::DesktopSize& view_size,
                                      const webrtc::DesktopRect& clip_area,
                                      webrtc::DesktopFrame* buffer,
                                      const webrtc::DesktopRegion& region,
-                                     const webrtc::DesktopRegion& shape) {
-  if (!task_runner_->BelongsToCurrentThread()) {
-    task_runner_->PostTask(FROM_HERE, base::Bind(
-        &FrameConsumerProxy::ApplyBuffer, this,
-        view_size, clip_area, buffer, region, shape));
-    return;
-  }
-
-  if (frame_consumer_.get())
-    frame_consumer_->ApplyBuffer(view_size, clip_area, buffer, region, shape);
+                                     const webrtc::DesktopRegion* shape) {
+  scoped_ptr<webrtc::DesktopRegion> shape_ptr;
+  if (shape)
+    shape_ptr = make_scoped_ptr(new webrtc::DesktopRegion(*shape));
+  task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(DoApplyBuffer, frame_consumer_, view_size, clip_area, buffer,
+                 region, base::Passed(&shape_ptr)));
 }
 
 void FrameConsumerProxy::ReturnBuffer(webrtc::DesktopFrame* buffer) {
-  if (!task_runner_->BelongsToCurrentThread()) {
-    task_runner_->PostTask(FROM_HERE, base::Bind(
-        &FrameConsumerProxy::ReturnBuffer, this, buffer));
-    return;
-  }
-
-  if (frame_consumer_.get())
-    frame_consumer_->ReturnBuffer(buffer);
+  task_runner_->PostTask(FROM_HERE, base::Bind(&FrameConsumer::ReturnBuffer,
+                                               frame_consumer_, buffer));
 }
 
 void FrameConsumerProxy::SetSourceSize(
     const webrtc::DesktopSize& source_size,
     const webrtc::DesktopVector& source_dpi) {
-  if (!task_runner_->BelongsToCurrentThread()) {
-    task_runner_->PostTask(FROM_HERE, base::Bind(
-        &FrameConsumerProxy::SetSourceSize, this, source_size, source_dpi));
-    return;
-  }
-
-  if (frame_consumer_.get())
-    frame_consumer_->SetSourceSize(source_size, source_dpi);
+  task_runner_->PostTask(
+      FROM_HERE, base::Bind(&FrameConsumer::SetSourceSize, frame_consumer_,
+                            source_size, source_dpi));
 }
 
 FrameConsumer::PixelFormat FrameConsumerProxy::GetPixelFormat() {