gpu: Refactor GpuMemoryBuffer framework for multi-process support.

ppapi/shared_impl/ppb_graphics_3d_shared.cc

 // 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.
 
 #include "ppapi/shared_impl/ppb_graphics_3d_shared.h"
 
 #include "base/logging.h"
 #include "gpu/command_buffer/client/gles2_cmd_helper.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
 #include "gpu/command_buffer/client/transfer_buffer.h"
@@ skipping 110 matching lines @@
   // process and the GPU process.
   const int32 kMinTransferBufferSize = 256 * 1024;
   const int32 kMaxTransferBufferSize = 16 * 1024 * 1024;
   transfer_buffer_.reset(new gpu::TransferBuffer(gles2_helper_.get()));
 
   // Create the object exposing the OpenGL API.
   gles2_impl_.reset(new gpu::gles2::GLES2Implementation(
       gles2_helper_.get(),
       share_gles2 ? share_gles2->share_group() : NULL,
       transfer_buffer_.get(),
-      true,
-      NULL  // Do not use GpuMemoryBuffers.
-      ));
+      true));
 
   if (!gles2_impl_->Initialize(
       transfer_buffer_size,
       kMinTransferBufferSize,
       std::max(kMaxTransferBufferSize, transfer_buffer_size))) {
     return false;
   }
 
   gles2_impl_->PushGroupMarkerEXT(0, "PPAPIContext");
 
@@ skipping 10 matching lines @@
 void PPB_Graphics3D_Shared::PushAlreadyLocked() {
   // Do nothing. This should be overridden in the plugin side.
 }
 
 void PPB_Graphics3D_Shared::PopAlreadyLocked() {
   // Do nothing. This should be overridden in the plugin side.
 }
 
 }  // namespace ppapi