Teach SkyShell how to draw with Ganesh

sky/shell/gpu_driver.h

-// Copyright 2015 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.
-
-#ifndef SKY_SHELL_GPU_DRIVER_H_
-#define SKY_SHELL_GPU_DRIVER_H_
-
-#include "base/memory/ref_counted.h"
-#include "base/memory/weak_ptr.h"
-#include "ui/gfx/native_widget_types.h"
-
-namespace gfx {
-class GLContext;
-class GLShareGroup;
-class GLSurface;
-}
-
-namespace sky {
-namespace shell {
-
-class GPUDriver {
- public:
-  explicit GPUDriver();
-  ~GPUDriver();
-
-  base::WeakPtr<GPUDriver> GetWeakPtr();
-
-  void Init(gfx::AcceleratedWidget widget);
-
- private:
-  scoped_refptr<gfx::GLShareGroup> share_group_;
-  scoped_refptr<gfx::GLSurface> surface_;
-  scoped_refptr<gfx::GLContext> context_;
-
-  base::WeakPtrFactory<GPUDriver> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(GPUDriver);
-};
-
-}  // namespace shell
-}  // namespace sky
-
-#endif  // SKY_SHELL_GPU_DRIVER_H_