Defer window destruction until GPU finished drawing.

chrome/common/gpu_messages_internal.h

 // 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.
 
 // This header is meant to be included in multiple passes, hence no traditional
 // header guard. It is included by backing_store_messages_internal.h
 // See ipc_message_macros.h for explanation of the macros and passes.
 
 // This file needs to be included again, even though we're actually included
 // from it via utility_messages.h.
@@ skipping 76 matching lines @@
   // Response to a GpuMsg_CollectGraphicsInfo.
   IPC_MESSAGE_CONTROL1(GpuHostMsg_GraphicsInfoCollected,
                        GPUInfo /* GPU logging stats */)
 
 #if defined(OS_LINUX)
   // Get the XID for a view ID.
   IPC_SYNC_MESSAGE_CONTROL1_1(GpuHostMsg_GetViewXID,
                               gfx::NativeViewId, /* view */
                               unsigned long /* xid */)
 
+  // Release the lock on the window.
+  // If the associated view has been destroyed, destroy the window.
+  IPC_MESSAGE_CONTROL1(GpuHostMsg_ReleaseXID,
+                       unsigned long /* xid */)
+
   IPC_SYNC_MESSAGE_CONTROL2_1(GpuHostMsg_ResizeXID,
                               unsigned long, /* xid */
                               gfx::Size, /* size */
                               bool /* success */)
 
 #elif defined(OS_MACOSX)
   // This message, used on Mac OS X 10.6 and later (where IOSurface is
   // supported), is sent from the GPU process to the browser to indicate that a
   // new backing store was allocated for the given "window" (fake
   // PluginWindowHandle). The renderer ID and render view ID are needed in
@@ skipping 230 matching lines @@
 
   // GpuVideoDecoder report output format change.
   IPC_MESSAGE_ROUTED1(GpuVideoDecoderHostMsg_MediaFormatChange,
                       GpuVideoDecoderFormatChangeParam)
 
   // GpuVideoDecoder report error.
   IPC_MESSAGE_ROUTED1(GpuVideoDecoderHostMsg_ErrorNotification,
                       GpuVideoDecoderErrorInfoParam)
 
 IPC_END_MESSAGES(GpuVideoDecoderHost)