Adds BeginFrameControl via DevTools.

content/browser/web_contents/web_contents_view_child_frame.cc

 // Copyright (c) 2016 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/web_contents/web_contents_view_child_frame.h"
 
 #include "build/build_config.h"
 #include "content/browser/frame_host/render_widget_host_view_child_frame.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/web_contents_view_delegate.h"
@@ skipping 89 matching lines @@
 }
 
 void WebContentsViewChildFrame::RenderViewCreated(RenderViewHost* host) {}
 
 void WebContentsViewChildFrame::RenderViewSwappedIn(RenderViewHost* host) {}
 
 void WebContentsViewChildFrame::SetOverscrollControllerEnabled(bool enabled) {
   // This is managed by the outer view.
 }
 
+ui::Compositor* WebContentsViewChildFrame::GetCompositor() const {
+  return GetOuterView()->GetCompositor();
+}
+
 #if defined(OS_MACOSX)
 bool WebContentsViewChildFrame::IsEventTracking() const {
   return false;
 }
 
 void WebContentsViewChildFrame::CloseTabAfterEventTracking() {
   NOTREACHED();
 }
 
 void WebContentsViewChildFrame::SetAllowOtherViews(bool allow) {
@@ skipping 45 matching lines @@
 void WebContentsViewChildFrame::StartDragging(
     const DropData& drop_data,
     WebDragOperationsMask ops,
     const gfx::ImageSkia& image,
     const gfx::Vector2d& image_offset,
     const DragEventSourceInfo& event_info) {
   NOTREACHED();
 }
 
 }  // namespace content