Fix context sharing between channels to be order-independent.

content/common/gpu/gpu_messages.h

 // 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.
 
 // Multiply-included message file, hence no include guard here, but see below
 // for a much smaller-than-usual include guard section.
 
 #include <vector>
 #include <string>
 
@@ skipping 132 matching lines @@
 // 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 client.  The channel name is returned in a
 // GpuHostMsg_ChannelEstablished message.  The client 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_CONTROL2(GpuMsg_EstablishChannel,
                      int /* client_id */,
-                     int /* share_client_id */)
+                     bool /* share_context */)
 
 // Tells the GPU process to close the channel identified by IPC channel
 // handle.  If no channel can be identified, do nothing.
 IPC_MESSAGE_CONTROL1(GpuMsg_CloseChannel,
                      IPC::ChannelHandle /* channel_handle */)
 
 // Tells the GPU process to create a new command buffer that renders directly
 // to a native view. A corresponding GpuCommandBufferStub is created.
 IPC_MESSAGE_CONTROL4(GpuMsg_CreateViewCommandBuffer,
                      gfx::GLSurfaceHandle, /* compositing_surface */
@@ skipping 330 matching lines @@
 
 // Confirm decoder has been flushed.
 IPC_MESSAGE_ROUTED0(AcceleratedVideoDecoderHostMsg_FlushDone)
 
 // Confirm decoder has been reset.
 IPC_MESSAGE_ROUTED0(AcceleratedVideoDecoderHostMsg_ResetDone)
 
 // Video decoder has encountered an error.
 IPC_MESSAGE_ROUTED1(AcceleratedVideoDecoderHostMsg_ErrorNotification,
                     uint32) /* Error ID */