Merge the Sky Engine changes from the SkyDart branch

sky/engine/core/app/ModuleLoader.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 SKY_ENGINE_CORE_APP_MODULELOADER_H_
-#define SKY_ENGINE_CORE_APP_MODULELOADER_H_
-
-#include "base/memory/weak_ptr.h"
-#include "sky/engine/platform/fetcher/MojoFetcher.h"
-#include "sky/engine/wtf/OwnPtr.h"
-#include "sky/engine/wtf/RefCounted.h"
-#include "sky/engine/wtf/RefPtr.h"
-
-namespace blink {
-class Application;
-class Document;
-class Module;
-
-class ModuleLoader : public MojoFetcher::Client {
- public:
-  class Client {
-   public:
-    virtual void OnModuleLoadComplete(ModuleLoader*, Module*) = 0;
-
-   protected:
-    virtual ~Client();
-  };
-
-  enum State {
-    LOADING,
-    COMPLETE,
-  };
-
-  ModuleLoader(Client*, Application*, const KURL&);
-  ~ModuleLoader();
-
-  State state() const { return state_; }
-  Module* module() const { return module_.get(); }
-
- private:
-  // MojoFetcher::Client
-  void OnReceivedResponse(mojo::URLResponsePtr) override;
-
-  void OnParsingComplete();
-
-  State state_;
-  Client* client_;
-  Application* application_;
-  OwnPtr<MojoFetcher> fetcher_;
-  RefPtr<Module> module_;
-
-  base::WeakPtrFactory<ModuleLoader> weak_factory_;
-};
-
-} // namespace blink
-
-#endif  // SKY_ENGINE_CORE_APP_MODULELOADER_H_