gpu: Use mojom.GpuService API for memory allocation.

content/common/gpu_host_messages.h

 // Copyright 2016 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 "build/build_config.h"
 #include "content/common/content_export.h"
 #include "gpu/command_buffer/common/sync_token.h"
 #include "gpu/config/gpu_feature_info.h"
 #include "gpu/config/gpu_info.h"
 #include "gpu/ipc/common/surface_handle.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_message_start.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 #include "ui/gfx/ipc/gfx_param_traits.h"
 
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT CONTENT_EXPORT
 
 #define IPC_MESSAGE_START GpuMsgStart
 
-IPC_STRUCT_BEGIN(GpuMsg_CreateGpuMemoryBuffer_Params)
-  IPC_STRUCT_MEMBER(gfx::GpuMemoryBufferId, id)
-  IPC_STRUCT_MEMBER(gfx::Size, size)
-  IPC_STRUCT_MEMBER(gfx::BufferFormat, format)
-  IPC_STRUCT_MEMBER(gfx::BufferUsage, usage)
-  IPC_STRUCT_MEMBER(int32_t, client_id)
-  IPC_STRUCT_MEMBER(gpu::SurfaceHandle, surface_handle)
-IPC_STRUCT_END()
-
 //------------------------------------------------------------------------------
 // GPU Messages
 // These are messages from the browser to the GPU process.
 
-// Tells the GPU process to create a new gpu memory buffer.
-IPC_MESSAGE_CONTROL1(GpuMsg_CreateGpuMemoryBuffer,
-                     GpuMsg_CreateGpuMemoryBuffer_Params)
-
-// Tells the GPU process to destroy buffer.
-IPC_MESSAGE_CONTROL3(GpuMsg_DestroyGpuMemoryBuffer,
-                     gfx::GpuMemoryBufferId, /* id */
-                     int32_t,                /* client_id */
-                     gpu::SyncToken /* sync_token */)
-
 // Tells the GPU process that the browser has seen a GPU switch.
 IPC_MESSAGE_CONTROL0(GpuMsg_GpuSwitched)
 
 //------------------------------------------------------------------------------
 // GPU Host Messages
 // These are messages to the browser.
 
-// Response from GPU to a GpuMsg_CreateGpuMemoryBuffer message.
-IPC_MESSAGE_CONTROL1(GpuHostMsg_GpuMemoryBufferCreated,
-                     gfx::GpuMemoryBufferHandle /* handle */)
-
 // Sent by the GPU process to indicate that a fields trial has been activated.
 IPC_MESSAGE_CONTROL1(GpuHostMsg_FieldTrialActivated, std::string /* name */)