Perform GPU-related initialization in GPU process in response to an...

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"
 
 #define IPC_MESSAGE_START GpuMsgStart
 
 namespace gfx {
 class Size;
 }
 
 namespace IPC {
 struct ChannelHandle;
 }
 
 struct GPUCreateCommandBufferConfig;
 class GPUInfo;
 
 //------------------------------------------------------------------------------
 // GPU Messages
 // These are messages from the browser to the GPU process.
+
+// Tells the GPU process to initialize itself. The browser explicitly
+// requests this be done so that we are guaranteed that the channel is set
+// up between the browser and GPU process before doing any work that might
+// potentially crash the GPU process. Detection of the child process
+// exiting abruptly is predicated on having the IPC channel set up.
+IPC_MESSAGE_CONTROL0(GpuMsg_Initialize)
+
 // Tells the GPU process to create a new channel for communication with a
 // given renderer.  The channel name is returned in a
 // GpuHostMsg_ChannelEstablished message.  The renderer ID is passed so that
 // the GPU process reuses an existing channel to that process if it exists.
 // This ID is a unique opaque identifier generated by the browser process.
 IPC_MESSAGE_CONTROL1(GpuMsg_EstablishChannel,
                      int /* renderer_id */)
 
 // Tells the GPU process to close the channel identified by IPC channel
 // handle.  If no channel can be identified, do nothing.
@@ skipping 290 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)