Move //sky/compositor to //sky/viewer/compositor

sky/compositor/rasterizer.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_COMPOSITOR_RASTERIZER_H_
-#define SKY_COMPOSITOR_RASTERIZER_H_
-
-#include "base/memory/scoped_ptr.h"
-#include "mojo/gpu/gl_texture.h"
-
-class SkPicture;
-
-namespace sky {
-
-class Rasterizer {
- public:
-  Rasterizer();
-  virtual ~Rasterizer();
-
-  virtual scoped_ptr<mojo::GLTexture> Rasterize(SkPicture* picture) = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(Rasterizer);
-};
-
-}  // namespace sky
-
-#endif  // SKY_COMPOSITOR_RASTERIZER_H_