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

content/browser/renderer_host/render_widget_host_view_aura.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_aura.h"
 
 #include "base/logging.h"
 #include "content/browser/renderer_host/backing_store_skia.h"
 #include "content/browser/renderer_host/render_widget_host.h"
 #include "content/browser/renderer_host/web_input_event_aura.h"
@@ skipping 411 matching lines @@
                    params.route_id, gpu_host_id));
     ui::Compositor* compositor = aura::RootWindow::GetInstance()->compositor();
     if (!compositor->HasObserver(this))
       compositor->AddObserver(this);
   }
 #else
   NOTREACHED();
 #endif
 }
 
+void RenderWidgetHostViewAura::AcceleratedSurfaceSuspend() {
+}
+
 #if defined(UI_COMPOSITOR_IMAGE_TRANSPORT)
 void RenderWidgetHostViewAura::AcceleratedSurfaceNew(
       int32 width,
       int32 height,
       uint64* surface_handle,
       TransportDIB::Handle* shm_handle) {
   scoped_refptr<AcceleratedSurfaceContainerLinux> surface(
       new AcceleratedSurfaceContainerLinux(gfx::Size(width, height)));
   if (!surface->Initialize(surface_handle)) {
     LOG(ERROR) << "Failed to create AcceleratedSurfaceContainer";
@@ skipping 619 matching lines @@
 // static
 void RenderWidgetHostView::GetDefaultScreenInfo(
     WebKit::WebScreenInfo* results) {
   const gfx::Size size = gfx::Screen::GetPrimaryMonitorSize();
   results->rect = WebKit::WebRect(0, 0, size.width(), size.height());
   results->availableRect = results->rect;
   // TODO(derat): Don't hardcode this?
   results->depth = 24;
   results->depthPerComponent = 8;
 }