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

content/renderer/web_ui_mojo_context_state.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_RENDERER_WEB_UI_MOJO_CONTEXT_STATE_H_
 #define CONTENT_RENDERER_WEB_UI_MOJO_CONTEXT_STATE_H_
 
 #include <set>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "gin/modules/module_registry_observer.h"
 #include "mojo/public/cpp/system/core.h"

[sky, 2014/06/26 17:03:52]

nit: I think you can remove this include now.

[Sam McNally, 2014/06/26 23:43:12]

Done.

 #include "v8/include/v8.h"
 
 namespace blink {
 class WebFrame;
 class WebURLResponse;
 }
 
 namespace gin {
 class ContextHolder;
 struct PendingModule;
 }
 
 namespace content {
 
 class ResourceFetcher;
 class WebUIRunner;
 
 // WebUIMojoContextState manages the modules needed for mojo bindings. It does
 // this by way of gin. Non-builtin modules are downloaded by way of
 // ResourceFetchers.
 class WebUIMojoContextState : public gin::ModuleRegistryObserver {
  public:
   WebUIMojoContextState(blink::WebFrame* frame,
                         v8::Handle<v8::Context> context);
   virtual ~WebUIMojoContextState();
 
-  // Called once the mojo::Handle is available.
-  void SetHandle(mojo::ScopedMessagePipeHandle handle);
+  void Run();
 
   // Returns true if at least one module was added.
   bool module_added() const { return module_added_; }
 
  private:
   class Loader;
 
   // Invokes FetchModule() for any modules that have not already been
   // downloaded.
   void FetchModules(const std::vector<std::string>& ids);
@@ skipping 25 matching lines @@
 
   // Set of modules we've fetched script from.
   std::set<std::string> fetched_modules_;
 
   DISALLOW_COPY_AND_ASSIGN(WebUIMojoContextState);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_WEB_UI_MOJO_CONTEXT_STATE_H_