Add a new app API to enable watchdog behavior restarts in kiosk apps

extensions/browser/api/runtime/runtime_api_delegate.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 EXTENSIONS_BROWSER_API_RUNTIME_RUNTIME_API_DELEGATE_H
 #define EXTENSIONS_BROWSER_API_RUNTIME_RUNTIME_API_DELEGATE_H
 
 #include "base/callback.h"
 #include "base/version.h"
 
@@ skipping 57 matching lines @@
   virtual bool GetPlatformInfo(api::runtime::PlatformInfo* info) = 0;
 
   // Request a restart of the host device. Returns false iff the device
   // will not be restarted.
   virtual bool RestartDevice(std::string* error_message) = 0;
 
   // Open |extension|'s options page, if it has one. Returns true if an
   // options page was opened, false otherwise. See the docs of the
   // chrome.runtime.openOptionsPage function for the gritty details.
   virtual bool OpenOptionsPage(const Extension* extension);
+
+  // Sets the callback that will be invoked when the host device is being
+  // shutdown or restarted.
+  virtual void SetOnDeviceShutdownCallback(const base::Closure& callback) = 0;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_RUNTIME_RUNTIME_API_DELEGATE_H