In CreateCompositorHostWindow, reply with null window handle if RenderViewHos...

chrome/browser/gpu_process_host.cc

 // Copyright (c) 2010 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 "chrome/browser/gpu_process_host.h"
 
 #include "app/app_switches.h"
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/thread.h"
@@ skipping 367 matching lines @@
   GpuProcessHost::Get()->Send(reply_msg);
 }
 
 void CreateCompositorHostWindowDispatcher(
     int renderer_id,
     int render_view_id,
     IPC::Message* reply_msg) {
   RenderViewHost* host = RenderViewHost::FromID(renderer_id,
                                                 render_view_id);
   if (!host) {
+    GpuHostMsg_CreateCompositorHostWindow::WriteReplyParams(reply_msg,
+        gfx::kNullPluginWindow);
+    BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      NewRunnableFunction(&SendDelayedReply, reply_msg));
     return;
   }
 
   RenderWidgetHostView* view = host->view();
   gfx::PluginWindowHandle id = view->CreateCompositorHostWindow();
 
 
   GpuHostMsg_CreateCompositorHostWindow::WriteReplyParams(reply_msg, id);
   BrowserThread::PostTask(
     BrowserThread::IO, FROM_HERE,
@@ skipping 100 matching lines @@
       false,  // Never use the zygote (GPU plugin can't be sandboxed).
       base::environment_vector(),
 #endif
       cmd_line);
 
   UMA_HISTOGRAM_ENUMERATION("GPU.GPUProcessLifetimeEvents",
                             kLaunched, kGPUProcessLifetimeEvent_Max);
   return true;
 }