[DevTools] Pass screencast commands to the renderer.

content/browser/devtools/renderer_overrides_handler.cc

 // Copyright (c) 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 "content/browser/devtools/renderer_overrides_handler.h"
 
 #include <map>
 #include <string>
 
 #include "base/barrier_closure.h"
@@ skipping 597 matching lines @@
   if (!host_)
     return command->InternalErrorResponse("Could not connect to view");
   bool visible = !host_->is_hidden();
   NotifyScreencastVisibility(visible);
   if (visible) {
     if (has_last_compositor_frame_metadata_)
       InnerSwapCompositorFrame();
     else
       host_->Send(new ViewMsg_ForceRedraw(host_->GetRoutingID(), 0));
   }
-  return command->SuccessResponse(NULL);
+  // Pass through to the renderer.
+  return NULL;
 }
 
 scoped_refptr<DevToolsProtocol::Response>
 RendererOverridesHandler::PageStopScreencast(
     scoped_refptr<DevToolsProtocol::Command> command) {
   last_frame_time_ = base::TimeTicks();
   screencast_command_ = NULL;
   UpdateTouchEventEmulationState();
-  return command->SuccessResponse(NULL);
+  // Pass through to the renderer.
+  return NULL;
 }
 
 void RendererOverridesHandler::ScreencastFrameCaptured(
     const std::string& format,
     int quality,
     const cc::CompositorFrameMetadata& metadata,
     bool success,
     const SkBitmap& bitmap) {
   if (!success) {
     if (capture_retry_count_) {
@@ skipping 687 matching lines @@
     return;
   bool enabled = touch_emulation_enabled_ || screencast_command_.get();
   host_->SetTouchEventEmulationEnabled(enabled);
   WebContentsImpl* web_contents = static_cast<WebContentsImpl*>(
       WebContents::FromRenderViewHost(host_));
   if (web_contents)
     web_contents->SetForceDisableOverscrollContent(enabled);
 }
 
 }  // namespace content