Add a Javascript wrapper around ServiceRegistry and expose it to WebUI.

content/common/mojo/service_registry_impl.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 CONTENT_COMMON_MOJO_SERVICE_REGISTRY_IMPL_H_
 #define CONTENT_COMMON_MOJO_SERVICE_REGISTRY_IMPL_H_
 
 #include <map>
 #include <queue>
 #include <string>
@@ skipping 23 matching lines @@
 
   // ServiceRegistry overrides.
   virtual void AddService(
       const std::string& service_name,
       const base::Callback<void(mojo::ScopedMessagePipeHandle)> service_factory)
       OVERRIDE;
   virtual void RemoveService(const std::string& service_name) OVERRIDE;
   virtual void GetRemoteInterface(
       const base::StringPiece& service_name,
       mojo::ScopedMessagePipeHandle handle) OVERRIDE;
+  virtual base::WeakPtr<ServiceRegistry> GetWeakPtr() OVERRIDE;
 
  private:
   // mojo::InterfaceImpl<mojo::IInterfaceProvider> overrides.
   virtual void GetInterface(
       const mojo::String& name,
       mojo::ScopedMessagePipeHandle client_handle) OVERRIDE;
   virtual void OnConnectionError() OVERRIDE;
 
   std::map<std::string, base::Callback<void(mojo::ScopedMessagePipeHandle)> >
       service_factories_;
   std::queue<std::pair<std::string, mojo::MessagePipeHandle> >
       pending_connects_;
   bool bound_;
+
+  base::WeakPtrFactory<ServiceRegistry> weak_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_MOJO_SERVICE_REGISTRY_IMPL_H_