Implemented support for GL constext share groups in the renderer process.

content/common/gpu/gpu_messages.h

 // Copyright (c) 2011 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>
 
 #include "base/shared_memory.h"
 #include "content/common/common_param_traits.h"
 #include "content/common/gpu/gpu_info.h"
 #include "content/common/gpu/gpu_process_launch_causes.h"
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "gpu/command_buffer/common/constants.h"
 #include "gpu/ipc/gpu_command_buffer_traits.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_message_macros.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/size.h"
 
 #define IPC_MESSAGE_START GpuMsgStart
 
 IPC_STRUCT_BEGIN(GPUCreateCommandBufferConfig)
+  IPC_STRUCT_MEMBER(int32, share_group_id)
   IPC_STRUCT_MEMBER(std::string, allowed_extensions)
   IPC_STRUCT_MEMBER(std::vector<int>, attribs)
   IPC_STRUCT_MEMBER(GURL, active_url)
 IPC_STRUCT_END()
 
 #if defined(OS_MACOSX)
 IPC_STRUCT_BEGIN(GpuHostMsg_AcceleratedSurfaceSetIOSurface_Params)
   IPC_STRUCT_MEMBER(int32, renderer_id)
   IPC_STRUCT_MEMBER(int32, render_view_id)
   IPC_STRUCT_MEMBER(gfx::PluginWindowHandle, window)
@@ skipping 475 matching lines @@
 
 // Confirm decoder has been reset.
 IPC_MESSAGE_ROUTED0(AcceleratedVideoDecoderHostMsg_ResetDone)
 
 // Decoder has faced end of stream marker in the stream.
 IPC_MESSAGE_ROUTED0(AcceleratedVideoDecoderHostMsg_EndOfStream)
 
 // Video decoder has encountered an error.
 IPC_MESSAGE_ROUTED1(AcceleratedVideoDecoderHostMsg_ErrorNotification,
                     uint32) /* Error ID */