Add support for chrome.app.window.create() to app_shell

apps/shell/browser/shell_extension_system.h

Index: apps/shell/browser/shell_extension_system.h
diff --git a/apps/shell/browser/shell_extension_system.h b/apps/shell/browser/shell_extension_system.h
index 85e33926d3123f9f260ec23484b724855eb696e1..39004117cf3f633f07b651414cb5308bd4d1cf78 100644
--- a/apps/shell/browser/shell_extension_system.h
+++ b/apps/shell/browser/shell_extension_system.h
@@ -40,6 +40,9 @@ class ShellExtensionSystem : public ExtensionSystem {
   // Returns true on success.
   bool LoadAndLaunchApp(const base::FilePath& app_dir);
 
+  // Closes the running app.
+  void CloseApp();
+
   // BrowserContextKeyedService implementation:
   virtual void Shutdown() OVERRIDE;
 
@@ -71,6 +74,9 @@ class ShellExtensionSystem : public ExtensionSystem {
  private:
   content::BrowserContext* browser_context_;  // Not owned.
 
+  // Extension ID for the app.
+  std::string app_id_;
+
   // Data to be accessed on the IO thread. Must outlive process_manager_.
   scoped_refptr<InfoMap> info_map_;