Support browser side thumbnailing for GPU composited pages on Windows.

content/browser/renderer_host/render_widget_host_view_gtk.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_gtk.h"
 
 // If this gets included after the gtk headers, then a bunch of compiler
 // errors happen because of a "#define Status int" in Xlib.h, which interacts
 // badly with net::URLRequestStatus::Status.
 #include "content/common/view_messages.h"
@@ skipping 1029 matching lines @@
 
 void RenderWidgetHostViewGtk::AcceleratedSurfaceSuspend() {
 }
 
 
 void RenderWidgetHostViewGtk::SetBackground(const SkBitmap& background) {
   content::RenderWidgetHostViewBase::SetBackground(background);
   host_->Send(new ViewMsg_SetBackground(host_->GetRoutingID(), background));
 }
 
+bool RenderWidgetHostViewGtk::CopyFromCompositingSurface(
+      const gfx::Size& size,
+      skia::PlatformCanvas* output) {
+  // TODO(mazda): Implement this.
+  NOTIMPLEMENTED();
+  return false;
+}
+
 void RenderWidgetHostViewGtk::ModifyEventForEdgeDragging(
     GtkWidget* widget, GdkEventMotion* event) {
   // If the widget is aligned with an edge of the monitor its on and the user
   // attempts to drag past that edge we track the number of times it has
   // occurred, so that we can force the widget to scroll when it otherwise
   // would be unable to, by modifying the (x,y) position in the drag
   // event that we forward on to webkit. If we get a move that's no longer a
   // drag or a drag indicating the user is no longer at that edge we stop
   // altering the drag events.
   int new_dragged_at_horizontal_edge = 0;
@@ skipping 366 matching lines @@
   return new RenderWidgetHostViewGtk(widget);
 }
 
 // static
 void content::RenderWidgetHostViewPort::GetDefaultScreenInfo(
     WebKit::WebScreenInfo* results) {
   GdkWindow* gdk_window =
       gdk_display_get_default_group(gdk_display_get_default());
   content::GetScreenInfoFromNativeWindow(gdk_window, results);
 }