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

extensions/browser/api/runtime/runtime_api_delegate.h

Index: extensions/browser/api/runtime/runtime_api_delegate.h
diff --git a/extensions/browser/api/runtime/runtime_api_delegate.h b/extensions/browser/api/runtime/runtime_api_delegate.h
index 21e9a6e271c92ac7ff601d66be9af8fef3bee8bc..926d635ce0713c5f86f46274a595d4a2564e57d5 100644
--- a/extensions/browser/api/runtime/runtime_api_delegate.h
+++ b/extensions/browser/api/runtime/runtime_api_delegate.h
@@ -75,6 +75,10 @@ class RuntimeAPIDelegate {
   // 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