Support browser side thumbnailing for GPU composited pages on Windows.

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/bind.h"
 #include "base/logging.h"
 #include "content/browser/renderer_host/backing_store_skia.h"
 #include "content/browser/renderer_host/image_transport_client.h"
@@ skipping 433 matching lines @@
   }
   image_transport_clients_.erase(surface_handle);
 }
 
 void RenderWidgetHostViewAura::SetBackground(const SkBitmap& background) {
   content::RenderWidgetHostViewBase::SetBackground(background);
   host_->SetBackground(background);
   window_->layer()->SetFillsBoundsOpaquely(background.isOpaque());
 }
 
+bool RenderWidgetHostViewAura::CopyFromCompositingSurface(
+      const gfx::Size& size,
+      skia::PlatformCanvas* output) {
+  // TODO(mazda): Implement this.
+  NOTIMPLEMENTED();
+  return false;
+}
+
 void RenderWidgetHostViewAura::GetScreenInfo(WebKit::WebScreenInfo* results) {
   GetDefaultScreenInfo(results);
 }
 
 gfx::Rect RenderWidgetHostViewAura::GetRootWindowBounds() {
   // TODO(beng): this is actually wrong, we are supposed to return the bounds
   //             of the container "top level" window, but we don't have a firm
   //             concept of what constitutes a toplevel right now, so just do
   //             this.
   return window_->GetScreenBounds();
@@ skipping 602 matching lines @@
     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;
   results->verticalDPI = 96;
   results->horizontalDPI = 96;
 }