Sketch new SkyView interface to the engine

sky/engine/public/sky/sky_view.h

Index: sky/engine/public/sky/sky_view.h
diff --git a/sky/engine/public/sky/sky_view.h b/sky/engine/public/sky/sky_view.h
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+// 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_ENGINE_PUBLIC_SKY_SKY_VIEW_H_
+#define SKY_ENGINE_PUBLIC_SKY_SKY_VIEW_H_
+
+#include <memory>
+#include "skia/ext/refptr.h"
+#include "sky/engine/public/platform/WebCommon.h"
+#include "sky/engine/public/platform/WebURL.h"
+#include "sky/engine/public/sky/sky_display_metrics.h"
+#include "third_party/skia/include/core/SkPicture.h"
+
+namespace blink {
+class WebInputEvent;
+
+class SkyView {
+ public:
+  static std::unique_ptr<SkyView> Create();
+  ~SkyView();
+
+  void SetDisplayMetrics(const SkyDisplayMetrics& metrics);
+  void Load(const WebURL& url);
+  skia::RefPtr<SkPicture> Paint();
+  bool HandleInputEvent(const WebInputEvent& event);
+
+ private:
+  SkyView();
+};
+
+} // namespace blink
+
+#endif  // SKY_ENGINE_PUBLIC_SKY_SKY_VIEW_H_