Add support to delay sending SwapbufferAck as needed.

ui/gl/gl_surface.cc

 // 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.
 
 #include "ui/gl/gl_surface.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 173 matching lines @@
 }
 
 bool GLSurface::SupportsPostSubBuffer() {
   return false;
 }
 
 unsigned int GLSurface::GetBackingFrameBufferObject() {
   return 0;
 }
 
+bool GLSurface::SwapBuffersAsync(const SwapCompletionCallback& callback) {
+  DCHECK(!IsSurfaceless());
+  bool success = SwapBuffers();
+  callback.Run();
+  return success;
+}
+
 bool GLSurface::PostSubBuffer(int x, int y, int width, int height) {
   return false;
 }
 
+bool GLSurface::PostSubBufferAsync(int x,
+                                   int y,
+                                   int width,
+                                   int height,
+                                   const SwapCompletionCallback& callback) {
+  bool success = PostSubBuffer(x, y, width, height);
+  callback.Run();
+  return success;
+}
+
 bool GLSurface::OnMakeCurrent(GLContext* context) {
   return true;
 }
 
 void GLSurface::NotifyWasBound() {
 }
 
 bool GLSurface::SetBackbufferAllocation(bool allocated) {
   return true;
 }
@@ skipping 87 matching lines @@
 }
 
 bool GLSurfaceAdapter::IsOffscreen() {
   return surface_->IsOffscreen();
 }
 
 bool GLSurfaceAdapter::SwapBuffers() {
   return surface_->SwapBuffers();
 }
 
+bool GLSurfaceAdapter::SwapBuffersAsync(
+    const SwapCompletionCallback& callback) {
+  return surface_->SwapBuffersAsync(callback);
+}
+
 bool GLSurfaceAdapter::PostSubBuffer(int x, int y, int width, int height) {
   return surface_->PostSubBuffer(x, y, width, height);
 }
 
+bool GLSurfaceAdapter::PostSubBufferAsync(
+    int x, int y, int width, int height,
+        const SwapCompletionCallback& callback) {
+  return surface_->PostSubBufferAsync(x, y, width, height, callback);
+}
+
 bool GLSurfaceAdapter::SupportsPostSubBuffer() {
   return surface_->SupportsPostSubBuffer();
 }
 
 gfx::Size GLSurfaceAdapter::GetSize() {
   return surface_->GetSize();
 }
 
 void* GLSurfaceAdapter::GetHandle() {
   return surface_->GetHandle();
@@ skipping 44 matching lines @@
       z_order, transform, image, bounds_rect, crop_rect);
 }
 
 bool GLSurfaceAdapter::IsSurfaceless() const {
   return surface_->IsSurfaceless();
 }
 
 GLSurfaceAdapter::~GLSurfaceAdapter() {}
 
 }  // namespace gfx