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

content/common/mojo/service_registry_impl.cc

 // 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.
 
 #include "content/common/mojo/service_registry_impl.h"
 
 #include "mojo/common/common_type_converters.h"
 
 namespace content {
 
-ServiceRegistryImpl::ServiceRegistryImpl() : bound_(false) {
+ServiceRegistryImpl::ServiceRegistryImpl()
+    : bound_(false), weak_factory_(this) {
 }
 
 ServiceRegistryImpl::ServiceRegistryImpl(mojo::ScopedMessagePipeHandle handle)
-    : bound_(false) {
+    : bound_(false), weak_factory_(this) {
   BindRemoteServiceProvider(handle.Pass());
 }
 
 ServiceRegistryImpl::~ServiceRegistryImpl() {
   while (!pending_connects_.empty()) {
     mojo::CloseRaw(pending_connects_.front().second);
     pending_connects_.pop();
   }
 }
 
@@ skipping 30 matching lines @@
     const base::StringPiece& service_name,
     mojo::ScopedMessagePipeHandle handle) {
   if (!bound_) {
     pending_connects_.push(
         std::make_pair(service_name.as_string(), handle.release()));
     return;
   }
   client()->ConnectToService(mojo::String::From(service_name), handle.Pass());
 }
 
+base::WeakPtr<ServiceRegistry> ServiceRegistryImpl::GetWeakPtr() {
+  return weak_factory_.GetWeakPtr();
+}
+
 void ServiceRegistryImpl::ConnectToService(
     const mojo::String& name,
     mojo::ScopedMessagePipeHandle client_handle) {
   std::map<std::string,
            base::Callback<void(mojo::ScopedMessagePipeHandle)> >::iterator it =
       service_factories_.find(name);
   if (it == service_factories_.end())
     return;
 
   it->second.Run(client_handle.Pass());
 }
 
 }  // namespace content