Revert of Mojo multiple command buffer support and sample

mojo/services/native_viewport/gpu_impl.h

-// 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 "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "mojo/public/cpp/bindings/interface_impl.h"
-#include "mojo/public/cpp/bindings/interface_request.h"
-#include "mojo/services/gles2/command_buffer.mojom.h"
-#include "mojo/services/public/interfaces/geometry/geometry.mojom.h"
-#include "mojo/services/public/interfaces/gpu/gpu.mojom.h"
-
-namespace gfx {
-class GLShareGroup;
-}
-
-namespace gpu {
-namespace gles2 {
-class MailboxManager;
-}
-}
-
-namespace mojo {
-
-class GpuImpl : public InterfaceImpl<Gpu> {
- public:
-  GpuImpl(const scoped_refptr<gfx::GLShareGroup>& share_group,
-          const scoped_refptr<gpu::gles2::MailboxManager> mailbox_manager);
-
-  virtual ~GpuImpl();
-
-  virtual void CreateOnscreenGLES2Context(
-      uint64_t native_viewport_id,
-      SizePtr size,
-      InterfaceRequest<CommandBuffer> command_buffer_request) OVERRIDE;
-
-  virtual void CreateOffscreenGLES2Context(
-      InterfaceRequest<CommandBuffer> command_buffer_request) OVERRIDE;
-
- private:
-  // We need to share these across all NativeViewport instances so that contexts
-  // they create can share resources with each other via mailboxes.
-  scoped_refptr<gfx::GLShareGroup> share_group_;
-  scoped_refptr<gpu::gles2::MailboxManager> mailbox_manager_;
-
-  DISALLOW_COPY_AND_ASSIGN(GpuImpl);
-};
-
-}  // namespace mojo