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
 // services exposed by the remote ServiceRegistry through GetInterface.
-class CONTENT_EXPORT ServiceRegistry {
+class CONTENT_EXPORT ServiceRegistry
+    : public base::SupportsWeakPtr<ServiceRegistry> {

[darin (slow to review), 2014/06/21 04:44:16]

Please use WeakPtrFactory instead. There was a chromium-dev@ thread some time
ago arguing that we should not be using SupportsWeakPtr anymore.

[Sam McNally, 2014/06/24 08:45:01]

Done.

  public:
   virtual ~ServiceRegistry() {}
 
   // Make the service created by |service_factory| available to the remote
   // InterfaceProvider. In response to each request for a service,
   // |service_factory| will be run with an InterfaceRequest<Interface>
   // representing that request.
   template <typename Interface>
   void AddService(const base::Callback<void(mojo::InterfaceRequest<Interface>)>
                       service_factory) {
@@ skipping 30 matching lines @@
       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_