Add IPC allowing GPU process to tell browser process to temporarily drop a front buffer.

content/browser/renderer_host/render_widget_host_view_win.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 "content/browser/renderer_host/render_widget_host_view_win.h"
 
 #include <algorithm>
 #include <peninputpanel_i.c>
 
 #include "base/bind.h"
@@ skipping 2122 matching lines @@
     RenderWidgetHost::AcknowledgeSwapBuffers(params.route_id, gpu_host_id);
   }
 }
 
 void RenderWidgetHostViewWin::AcceleratedSurfacePostSubBuffer(
     const GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params& params,
     int gpu_host_id) {
   RenderWidgetHost::AcknowledgePostSubBuffer(params.route_id, gpu_host_id);
 }
 
+void RenderWidgetHostViewWin::AcceleratedSurfaceSuspend() {
+    if (!accelerated_surface_.get())
+      return;
+
+    accelerated_surface_->Suspend();
+}
+
 void RenderWidgetHostViewWin::SetAccessibilityFocus(int acc_obj_id) {
   if (!render_widget_host_)
     return;
 
   render_widget_host_->AccessibilitySetFocus(acc_obj_id);
 }
 
 void RenderWidgetHostViewWin::AccessibilityDoDefaultAction(int acc_obj_id) {
   if (!render_widget_host_)
     return;
@@ skipping 432 matching lines @@
 void RenderWidgetHostViewWin::ResetPointerDownContext() {
   // If the default focus on the page is on an edit field and we did not
   // receive a focus change in the context of a pointer down message, it means
   // that the pointer down message occurred on the edit field and we should
   // display the on screen keyboard
   if (!received_focus_change_after_pointer_down_ && virtual_keyboard_)
     DisplayOnScreenKeyboardIfNeeded();
   received_focus_change_after_pointer_down_ = false;
   pointer_down_context_ = false;
 }