Make reftests work for sky.

sky/compositor/display_delegate_ganesh.h

+// 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_GANESH_H_
+#define SKY_COMPOSITOR_DISPLAY_DELEGATE_GANESH_H_
+
+#include "sky/compositor/display_delegate.h"
+
+namespace sky {
+
+class LayerClient;
+
+class DisplayDelegateGanesh final : public DisplayDelegate {
+ public:
+  explicit DisplayDelegateGanesh(LayerClient* client) : client_(client) {}
+  ~DisplayDelegateGanesh() 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:
+  LayerClient* client_;
+  DISALLOW_COPY_AND_ASSIGN(DisplayDelegateGanesh);
+};
+
+}  // namespace sky
+
+#endif  // SKY_COMPOSITOR_DISPLAY_DELEGATE_GANESH_H_