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

chrome/browser/extensions/api/runtime/chrome_runtime_api_delegate.h

Index: chrome/browser/extensions/api/runtime/chrome_runtime_api_delegate.h
diff --git a/chrome/browser/extensions/api/runtime/chrome_runtime_api_delegate.h b/chrome/browser/extensions/api/runtime/chrome_runtime_api_delegate.h
index 6ff1a05aef213e2301a6b1664bfa3dda6331f1a5..e4a09b6c1cfc2dfee680a8bf75fd7e8be933bc75 100644
--- a/chrome/browser/extensions/api/runtime/chrome_runtime_api_delegate.h
+++ b/chrome/browser/extensions/api/runtime/chrome_runtime_api_delegate.h
@@ -59,6 +59,7 @@ class ChromeRuntimeAPIDelegate : public extensions::RuntimeAPIDelegate,
   bool GetPlatformInfo(extensions::api::runtime::PlatformInfo* info) override;
   bool RestartDevice(std::string* error_message) override;
   bool OpenOptionsPage(const extensions::Extension* extension) override;
+  void SetOnDeviceShutdownCallback(const base::Closure& callback) override;
 
   // content::NotificationObserver implementation.
   void Observe(int type,
@@ -78,6 +79,8 @@ class ChromeRuntimeAPIDelegate : public extensions::RuntimeAPIDelegate,
 
   content::NotificationRegistrar registrar_;
 
+  base::Closure on_device_shutdown_callback_;
+
   // Whether the API registered with the ExtensionService to receive
   // update notifications.
   bool registered_for_updates_;