Make reftests work for sky.

sky/compositor/display_delegate.h

Index: sky/compositor/display_delegate.h
diff --git a/sky/compositor/display_delegate.h b/sky/compositor/display_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..800e4c7562563cfa84e1d92f68df574aba911334
--- /dev/null
+++ b/sky/compositor/display_delegate.h
@@ -0,0 +1,43 @@
+// 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_H_
+#define SKY_COMPOSITOR_DISPLAY_DELEGATE_H_
+
+#include <vector>
+
+#include "mojo/skia/ganesh_surface.h"
+
+class SkCanvas;
+
+namespace gfx {
+class Rect;
+}
+
+namespace sky {
+
+class DisplayDelegate;
+class LayerClient;
+
+typedef DisplayDelegate* (*CreateDisplayDelegate)(LayerClient*);
+
+class DisplayDelegate {
+ public:
+  DisplayDelegate() {}
+  virtual ~DisplayDelegate() {}
+
+  static DisplayDelegate* create(LayerClient*);
+  static void setDisplayDelegateCreateFunction(CreateDisplayDelegate);
+
+  virtual void GetPixelsForTesting(std::vector<unsigned char>* pixels) = 0;
+  virtual void Paint(mojo::GaneshSurface& surface, const gfx::Rect& size) = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(DisplayDelegate);
+};
+
+
+
+}  // namespace sky
+
+#endif  // SKY_COMPOSITOR_DISPLAY_DELEGATE_H_