sky/shell should link with sky/engine

sky/shell/ui/platform_impl.h

+// 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_SHELL_UI_PLATFORM_IMPL_H_
+#define SKY_SHELL_UI_PLATFORM_IMPL_H_
+
+#include "base/message_loop/message_loop.h"
+#include "sky/engine/public/platform/Platform.h"
+
+namespace sky {
+namespace shell {
+
+class PlatformImpl : public blink::Platform {
+ public:
+  PlatformImpl();
+  ~PlatformImpl() override;
+
+  // blink::Platform:
+  blink::WebString defaultLocale() override;
+  base::SingleThreadTaskRunner* mainThreadTaskRunner() override;
+
+ private:
+  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(PlatformImpl);
+};
+
+}  // namespace shell
+}  // namespace sky
+
+#endif  // SKY_SHELL_UI_PLATFORM_IMPL_H_