Introduce the Blink NotificationService, move permission checks there

content/renderer/mojo/blink_service_registry_impl.h

 // Copyright 2016 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 CONTENT_RENDERER_MOJO_BLINK_SERVICE_REGISTRY_IMPL_H_
 #define CONTENT_RENDERER_MOJO_BLINK_SERVICE_REGISTRY_IMPL_H_
 
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "mojo/public/cpp/system/message_pipe.h"
 #include "third_party/WebKit/public/platform/ServiceRegistry.h"
 
+namespace base {
+class SingleThreadTaskRunner;
+}
+
 namespace content {
 
 class ServiceRegistry;
 
 // An implementation of blink::ServiceRegistry that forwards to a
 // content::ServiceRegistry.
 class BlinkServiceRegistryImpl : public blink::ServiceRegistry {
  public:
   explicit BlinkServiceRegistryImpl(
       base::WeakPtr<content::ServiceRegistry> service_registry);
   ~BlinkServiceRegistryImpl();
 
   // blink::ServiceRegistry override.
   void connectToRemoteService(const char* name,
                               mojo::ScopedMessagePipeHandle handle) override;
 
  private:
   const base::WeakPtr<content::ServiceRegistry> service_registry_;
 
+  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
+
+  base::WeakPtrFactory<BlinkServiceRegistryImpl> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(BlinkServiceRegistryImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MOJO_BLINK_SERVICE_REGISTRY_IMPL_H_