Sky should use an SkPicture when drawing

sky/compositor/rasterizer.h

Index: sky/compositor/rasterizer.h
diff --git a/sky/compositor/rasterizer.h b/sky/compositor/rasterizer.h
new file mode 100644
index 0000000000000000000000000000000000000000..7b1a4fad5a2d30724b4a8e10173fb87cbe1bd2fb
--- /dev/null
+++ b/sky/compositor/rasterizer.h
@@ -0,0 +1,28 @@
+// 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_