Introduce blink::ServiceProvider

sky/engine/public/platform/ServiceProvider.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_ENGINE_PUBLIC_PLATOFORM_SERVICES_H_
+#define SKY_ENGINE_PUBLIC_PLATOFORM_SERVICES_H_
+
+namespace mojo {
+class NavigatorHost;
+}
+
+namespace blink {
+
+class ServiceProvider {
+ public:
+  virtual mojo::NavigatorHost* NavigatorHost() = 0;
+
+ protected:
+  virtual ~ServiceProvider();
+};
+
+} // namespace blink
+
+#endif