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

content/public/common/service_registry.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_PUBLIC_COMMON_SERVICE_REGISTRY_H_
 #define CONTENT_PUBLIC_COMMON_SERVICE_REGISTRY_H_
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/callback.h"
+#include "base/memory/weak_ptr.h"
 #include "base/strings/string_piece.h"
 #include "content/common/content_export.h"
 #include "mojo/public/cpp/bindings/interface_ptr.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "mojo/public/cpp/system/core.h"
 
 namespace content {
 
 // A ServiceRegistry exposes local services that have been added using
 // AddService to a paired remote ServiceRegistry and provides local access to
@@ skipping 29 matching lines @@
   // Connect to an interface provided by the remote interface provider.
   template <typename Interface>
   void GetRemoteInterface(mojo::InterfacePtr<Interface>* ptr) {
     mojo::MessagePipe pipe;
     ptr->Bind(pipe.handle0.Pass());
     GetRemoteInterface(Interface::Name_, pipe.handle1.Pass());
   }
   virtual void GetRemoteInterface(const base::StringPiece& name,
                                   mojo::ScopedMessagePipeHandle handle) = 0;
 
+  virtual base::WeakPtr<ServiceRegistry> GetWeakPtr() = 0;

[darin (slow to review), 2014/06/28 21:10:38]

hmm, it seems a bit uncommon to expose a WeakPtr to an interface like this. i
wonder if that suggests an anti-pattern. hmm...

[Sam McNally, 2014/06/30 01:26:14]

Removed it.

+
  private:
   template <typename Interface>
   static void ForwardToServiceFactory(
       const base::Callback<void(mojo::InterfaceRequest<Interface>)>
           service_factory,
       mojo::ScopedMessagePipeHandle handle) {
     service_factory.Run(mojo::MakeRequest<Interface>(handle.Pass()));
   }
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_SERVICE_REGISTRY_H_