Mac: Don't hang gpu process on popup close under certain conditions

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.
 
 #include <vector>
 #include <string>
 
 #include "base/shared_memory.h"
 #include "chrome/common/gpu_video_common.h"
 #include "ipc/ipc_message_macros.h"
@@ skipping 41 matching lines @@
 #if defined(OS_MACOSX)
 // Tells the GPU process that the browser process handled the swap
 // buffers request with the given number. Note that it is possible
 // for the browser process to coalesce frames; it is not guaranteed
 // that every GpuHostMsg_AcceleratedSurfaceBuffersSwapped message
 // will result in a buffer swap on the browser side.
 IPC_MESSAGE_CONTROL3(GpuMsg_AcceleratedSurfaceBuffersSwappedACK,
                      int /* renderer_id */,
                      int32 /* route_id */,
                      uint64 /* swap_buffers_count */)
+
+// Tells the GPU process that the IOSurface of the buffer belonging to
+// |renderer_route_id| a given id was destroyed, either by the user closing the
+// tab hosting the surface, or by the renderer navigating to a new page.
+IPC_MESSAGE_CONTROL2(GpuMsg_DidDestroySurface,

[Ken Russell (switch to Gerrit), 2010/12/22 23:16:44]

You might want to call this DidDestroyAcceleratedSurface to match the other
similar message names; this is not a big deal however.

+                     int /* renderer_id */,
+                     int32 /* renderer_route_id */)
 #endif
 
 // Tells the GPU process to crash.
 IPC_MESSAGE_CONTROL0(GpuMsg_Crash)
 
 // Tells the GPU process to hang.
 IPC_MESSAGE_CONTROL0(GpuMsg_Hang)
 
 //------------------------------------------------------------------------------
 // GPU Host Messages
@@ skipping 249 matching lines @@
 // Release all video frames allocated for a hardware video decoder.
 IPC_MESSAGE_ROUTED0(GpuVideoDecoderHostMsg_ReleaseAllVideoFrames)
 
 // GpuVideoDecoder report output format change.
 IPC_MESSAGE_ROUTED1(GpuVideoDecoderHostMsg_MediaFormatChange,
                     GpuVideoDecoderFormatChangeParam)
 
 // GpuVideoDecoder report error.
 IPC_MESSAGE_ROUTED1(GpuVideoDecoderHostMsg_ErrorNotification,
                     GpuVideoDecoderErrorInfoParam)