Use surface copy requests for layout tests.

content/renderer/render_thread_impl.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 221 matching lines @@
   // If there is a pending asynchronous request, it will be completed by the
   // time this routine returns.
   scoped_refptr<gpu::GpuChannelHost> EstablishGpuChannelSync(CauseForGpuLaunch);
 
   std::unique_ptr<cc::OutputSurface> CreateCompositorOutputSurface(
       bool use_software,
       int routing_id,
       scoped_refptr<FrameSwapMessageQueue> frame_swap_message_queue,
       const GURL& url);
 
+  std::unique_ptr<cc::SwapPromise> RequestCopyOfOutputForLayoutTest(
+      int32_t routing_id,
+      std::unique_ptr<cc::CopyOutputRequest> request);
+
   // True if we are running layout tests. This currently disables forwarding
   // various status messages to the console, skips network error pages, and
   // short circuits size update and focus events.
   bool layout_test_mode() const { return !!layout_test_deps_; }
   void set_layout_test_dependencies(
       std::unique_ptr<LayoutTestDependencies> deps) {
     layout_test_deps_ = std::move(deps);
   }
 
   RendererBlinkPlatformImpl* blink_platform_impl() const {
@@ skipping 451 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_