Allow app_shell to run past extension manifest parsing

apps/shell/shell_extension_system.h

 // Copyright 2013 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 APPS_SHELL_SHELL_EXTENSION_SYSTEM_H_
 #define APPS_SHELL_SHELL_EXTENSION_SYSTEM_H_
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "extensions/common/one_shot_event.h"
 
+namespace base {
+class FilePath;
+}
+
 namespace content {
 class BrowserContext;
 }
 
 namespace extensions {
 
 class EventRouter;
 class LazyBackgroundTaskQueue;
 class ProcessManager;
 
 // A simplified version of ExtensionSystem for app_shell. Allows
 // app_shell to skip initialization of services it doesn't need.
 class ShellExtensionSystem : public ExtensionSystem {
  public:
   explicit ShellExtensionSystem(content::BrowserContext* browser_context);
   virtual ~ShellExtensionSystem();
 
+  // Loads an unpacked application from a directory and attempts to launch it.
+  // Returns true on success.
+  bool LoadAndLaunchApp(const base::FilePath& app_dir);
+
   // BrowserContextKeyedService implementation:
   virtual void Shutdown() OVERRIDE;
 
   // ExtensionSystem implementation:
   virtual void InitForRegularProfile(bool extensions_enabled) OVERRIDE;
   virtual ExtensionService* extension_service() OVERRIDE;
   virtual ManagementPolicy* management_policy() OVERRIDE;
   virtual UserScriptMaster* user_script_master() OVERRIDE;
   virtual ProcessManager* process_manager() OVERRIDE;
   virtual StateStore* state_store() OVERRIDE;
@@ skipping 22 matching lines @@
 
   // Signaled when the extension system has completed its startup tasks.
   OneShotEvent ready_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellExtensionSystem);
 };
 
 }  // namespace extensions
 
 #endif  // APPS_SHELL_SHELL_EXTENSION_SYSTEM_H_