3D Compositing in <browser>, first draft.

content/browser/gpu/gpu_process_host_ui_shim.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/gpu/gpu_process_host_ui_shim.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 234 matching lines @@
                                         gfx::Size size) {
   // Always respond even if the window no longer exists. The GPU process cannot
   // make progress on the resizing command buffer until it receives the
   // response.
   ScopedSendOnIOThread delayed_send(
       host_id_,
       new AcceleratedSurfaceMsg_ResizeViewACK(route_id));
 
   RenderWidgetHostViewPort* view =
       GetRenderWidgetHostViewFromSurfaceID(surface_id);
-  if (!view)
+  if (!view || !view->ResizeNeedsNewSurface())
     return;
 
   gfx::GLSurfaceHandle surface = view->GetCompositingSurface();
 
   // Resize the window synchronously. The GPU process must not issue GL
   // calls on the command buffer until the window is the size it expects it
   // to be.
 #if defined(TOOLKIT_GTK)
   GdkWindow* window = reinterpret_cast<GdkWindow*>(
       gdk_xid_table_lookup(surface.handle));
@@ skipping 94 matching lines @@
 }
 
 void GpuProcessHostUIShim::OnAcceleratedSurfaceRelease(
     const GpuHostMsg_AcceleratedSurfaceRelease_Params& params) {
   RenderWidgetHostViewPort* view = GetRenderWidgetHostViewFromSurfaceID(
       params.surface_id);
   if (!view)
     return;
   view->AcceleratedSurfaceRelease(params.identifier);
 }