Pass initial size and GPU preference via context attributes

gpu/ipc/common/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 <stdint.h>
 
 #include <string>
@@ skipping 37 matching lines @@
 
 #define IPC_MESSAGE_START GpuChannelMsgStart
 
 IPC_STRUCT_BEGIN(GPUCommandBufferConsoleMessage)
   IPC_STRUCT_MEMBER(int32_t, id)
   IPC_STRUCT_MEMBER(std::string, message)
 IPC_STRUCT_END()
 
 IPC_STRUCT_BEGIN(GPUCreateCommandBufferConfig)
   IPC_STRUCT_MEMBER(gpu::SurfaceHandle, surface_handle)
-  IPC_STRUCT_MEMBER(gfx::Size, size)
   IPC_STRUCT_MEMBER(int32_t, share_group_id)
   IPC_STRUCT_MEMBER(int32_t, stream_id)
   IPC_STRUCT_MEMBER(gpu::GpuStreamPriority, stream_priority)
   IPC_STRUCT_MEMBER(gpu::gles2::ContextCreationAttribHelper, attribs)
   IPC_STRUCT_MEMBER(GURL, active_url)
-  IPC_STRUCT_MEMBER(gl::GpuPreference, gpu_preference)
 IPC_STRUCT_END()
 
 IPC_STRUCT_BEGIN(GpuCommandBufferMsg_CreateImage_Params)
   IPC_STRUCT_MEMBER(int32_t, id)
   IPC_STRUCT_MEMBER(gfx::GpuMemoryBufferHandle, gpu_memory_buffer)
   IPC_STRUCT_MEMBER(gfx::Size, size)
   IPC_STRUCT_MEMBER(gfx::BufferFormat, format)
   IPC_STRUCT_MEMBER(uint32_t, internal_format)
   IPC_STRUCT_MEMBER(uint64_t, image_release_count)
 IPC_STRUCT_END()
@@ skipping 167 matching lines @@
                     GpuCommandBufferMsg_CreateImage_Params /* params */)
 
 // Destroy a previously created image.
 IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_DestroyImage, int32_t /* id */)
 
 // Attaches an external image stream to the client texture.
 IPC_SYNC_MESSAGE_ROUTED2_1(GpuCommandBufferMsg_CreateStreamTexture,
                            uint32_t, /* client_texture_id */
                            int32_t,  /* stream_id */
                            bool /* succeeded */)