Revert of Mojo multiple command buffer support and sample

mojo/services/native_viewport/gpu_impl.cc

-// Copyright 2013 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 "mojo/services/native_viewport/gpu_impl.h"
-
-#include "gpu/command_buffer/service/mailbox_manager.h"
-#include "mojo/services/gles2/command_buffer_impl.h"
-#include "mojo/services/public/cpp/geometry/geometry_type_converters.h"
-#include "ui/gl/gl_share_group.h"
-
-namespace mojo {
-
-GpuImpl::GpuImpl(
-    const scoped_refptr<gfx::GLShareGroup>& share_group,
-    const scoped_refptr<gpu::gles2::MailboxManager> mailbox_manager)
-    : share_group_(share_group), mailbox_manager_(mailbox_manager) {
-}
-
-GpuImpl::~GpuImpl() {
-}
-
-void GpuImpl::CreateOnscreenGLES2Context(
-    uint64_t native_viewport_id,
-    SizePtr size,
-    InterfaceRequest<CommandBuffer> command_buffer_request) {
-  BindToRequest(new CommandBufferImpl(reinterpret_cast<gfx::AcceleratedWidget>(
-                                          native_viewport_id),
-                                      size.To<gfx::Size>(),
-                                      share_group_.get(),
-                                      mailbox_manager_.get()),
-                &command_buffer_request);
-}
-
-void GpuImpl::CreateOffscreenGLES2Context(
-    InterfaceRequest<CommandBuffer> command_buffer_request) {
-  BindToRequest(
-      new CommandBufferImpl(share_group_.get(), mailbox_manager_.get()),
-      &command_buffer_request);
-}
-
-}  // namespace mojo