Make reftests work for sky.

sky/compositor/display_delegate_bitmap.h

Index: sky/compositor/display_delegate_bitmap.h
diff --git a/sky/compositor/display_delegate_bitmap.h b/sky/compositor/display_delegate_bitmap.h
new file mode 100644
index 0000000000000000000000000000000000000000..4df1cf90a5ae89d78b5698034ceccfcb1a675e35
--- /dev/null
+++ b/sky/compositor/display_delegate_bitmap.h
@@ -0,0 +1,33 @@
+// Copyright 2014 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_DISPLAY_DELEGATE_BITMAP_H_
+#define SKY_COMPOSITOR_DISPLAY_DELEGATE_BITMAP_H_
+
+#include "sky/compositor/display_delegate.h"
+
+namespace sky {
+
+class LayerClient;
+
+class DisplayDelegateBitmap final : public DisplayDelegate {
+ public:
+  explicit DisplayDelegateBitmap(LayerClient* client);
+  ~DisplayDelegateBitmap() override;
+
+  static DisplayDelegate* create(LayerClient* client);
+
+  void GetPixelsForTesting(std::vector<unsigned char>* pixels) override;
+  void Paint(mojo::GaneshSurface& surface, const gfx::Rect& size) override;
+
+ private:
+  SkBitmap bitmap_;
+  LayerClient* client_;
+
+  DISALLOW_COPY_AND_ASSIGN(DisplayDelegateBitmap);
+};
+
+}  // namespace sky
+
+#endif  // SKY_COMPOSITOR_DISPLAY_DELEGATE_BITMAP_H_