Standalone Mojo Javascript application

mojo/apps/js/js_app.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 MOJO_APPS_JS_JS_APP_H_
 #define MOJO_APPS_JS_JS_APP_H_
 
 #include "base/memory/ref_counted.h"
-#include "base/single_thread_task_runner.h"
 #include "base/threading/thread.h"
 #include "gin/public/isolate_holder.h"
 #include "gin/shell_runner.h"
 #include "mojo/apps/js/mojo_runner_delegate.h"
 #include "mojo/services/public/interfaces/content_handler/content_handler.mojom.h"
 
 namespace mojo {
 namespace apps {
 
 class JSApp;
 class ApplicationDelegateImpl;
 
 // Each JavaScript app started by content handler runs on its own thread and
 // in its own V8 isolate. This class represents one running JS app.
-//
-// The lifetime of this class is defined by the content handler's internal
-// "app_vector" list.
 
 class JSApp {
  public:
-  JSApp(ApplicationDelegateImpl* content_handler_app,
-        const std::string& url,
-        URLResponsePtr content);
-  ~JSApp();
+  JSApp(ApplicationDelegateImpl* app_delegate_impl);
+  virtual ~JSApp();
 
+  // Launch this app on a new thread. This method can be called on any thread.
+  // This method causes Load() and then Run() to run on a new thread.
   bool Start();
+
+
+  // Subclasses must return the JS source code for this app's main script and
+  // the filename or URL that identifies the script's origin. This method will
+  // be called from this app's thread.
+  virtual bool Load(std::string* source, std::string* file_name) = 0;
+
+  // Called by the JS mojo module to quit this JS app. See mojo_module.cc.
   void Quit();
+
+  // Called by the JS mojo module to connect to a Mojo service.
   Handle ConnectToService(const std::string& application_url,
                           const std::string& interface_name);
 
  private:
   void Run();
   void Terminate();
 
   // Used to CHECK that we're running on the correct thread.
-  bool on_content_handler_thread() const;
+  bool on_app_delegate_impl_thread() const;
   bool on_js_app_thread() const;
 
-  ApplicationDelegateImpl* content_handler_app_;
-  std::string url_;
-  URLResponsePtr content_;
+  ApplicationDelegateImpl* app_delegate_impl_;
   base::Thread thread_;
-  scoped_refptr<base::SingleThreadTaskRunner> content_handler_task_runner_;
+  scoped_refptr<base::SingleThreadTaskRunner> app_delegate_impl_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> js_app_task_runner_;
   MojoRunnerDelegate runner_delegate_;
   scoped_ptr<gin::IsolateHolder> isolate_holder_;
   scoped_ptr<gin::ShellRunner> shell_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(JSApp);
 };
 
 }  // namespace apps
 }  // namespace mojo
 
 #endif  // MOJO_APPS_JS_JS_APP_H_