Sketch new SkyView interface to the engine

sky/engine/public/sky/sky_display_metrics.h

Index: sky/engine/public/sky/sky_display_metrics.h
diff --git a/sky/engine/public/sky/sky_display_metrics.h b/sky/engine/public/sky/sky_display_metrics.h
new file mode 100644
index 0000000000000000000000000000000000000000..5bdff08f6531d54620b8b205a5d17404a10e915a
--- /dev/null
+++ b/sky/engine/public/sky/sky_display_metrics.h
@@ -0,0 +1,19 @@
+// 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_DISPLAY_METRICS_H_
+#define SKY_ENGINE_PUBLIC_SKY_SKY_DISPLAY_METRICS_H_
+
+#include "sky/engine/public/platform/WebSize.h"
+
+namespace blink {
+
+struct SkyDisplayMetrics {
+  WebSize size;
+  float device_pixel_ratio;
+};
+
+} // namespace blink
+
+#endif  // SKY_ENGINE_PUBLIC_SKY_SKY_DISPLAY_METRICS_H_