[Do not submit] D3DKMTWaitForVerticalBlankEvent VSync prototype

content/browser/compositor/gpu_browser_compositor_output_surface.cc

 // Copyright 2014 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/compositor/gpu_browser_compositor_output_surface.h"
 
 #include <utility>
 
 #include "build/build_config.h"
 #include "cc/output/output_surface_client.h"
@@ skipping 22 matching lines @@
     capabilities_.flipped_output_surface =
         context_provider()->ContextCapabilities().flips_vertically;
   }
 }
 
 GpuBrowserCompositorOutputSurface::~GpuBrowserCompositorOutputSurface() {
   GetCommandBufferProxy()->SetUpdateVSyncParametersCallback(
       UpdateVSyncParametersCallback());
 }
 
+GpuVSyncControl* GpuBrowserCompositorOutputSurface::GetVSyncControl() {
+#if defined(OS_WIN)
+  return this;
+#else
+  return nullptr;
+#endif  // defined(OS_WIN)
+}
+
+void GpuBrowserCompositorOutputSurface::EnableVSync(bool enabled) {
+#if defined(OS_WIN)
+  GetCommandBufferProxy()->EnableVSync(enabled);
+#else
+  NOTREACHED();
+#endif  // defined(OS_WIN)
+}
+
 void GpuBrowserCompositorOutputSurface::OnGpuSwapBuffersCompleted(
     const std::vector<ui::LatencyInfo>& latency_info,
     gfx::SwapResult result,
     const gpu::GpuProcessHostedCALayerTreeParamsMac* params_mac) {
   RenderWidgetHostImpl::CompositorFrameDrawn(latency_info);
   client_->DidReceiveSwapBuffersAck();
 }
 
 void GpuBrowserCompositorOutputSurface::OnReflectorChanged() {
   if (!reflector_) {
@@ skipping 84 matching lines @@
 GpuBrowserCompositorOutputSurface::GetCommandBufferProxy() {
   ui::ContextProviderCommandBuffer* provider_command_buffer =
       static_cast<ui::ContextProviderCommandBuffer*>(context_provider_.get());
   gpu::CommandBufferProxyImpl* command_buffer_proxy =
       provider_command_buffer->GetCommandBufferProxy();
   DCHECK(command_buffer_proxy);
   return command_buffer_proxy;
 }
 
 }  // namespace content