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

extensions/shell/browser/shell_runtime_api_delegate.h

Index: extensions/shell/browser/shell_runtime_api_delegate.h
diff --git a/extensions/shell/browser/shell_runtime_api_delegate.h b/extensions/shell/browser/shell_runtime_api_delegate.h
index f0a8d3860fcd68f120e31ed97c74e1d6871f2209..7d07b27c5f8b4526659ce4e9a2b070fa6bb030cf 100644
--- a/extensions/shell/browser/shell_runtime_api_delegate.h
+++ b/extensions/shell/browser/shell_runtime_api_delegate.h
@@ -26,6 +26,7 @@ class ShellRuntimeAPIDelegate : public RuntimeAPIDelegate {
   void OpenURL(const GURL& uninstall_url) override;
   bool GetPlatformInfo(api::runtime::PlatformInfo* info) override;
   bool RestartDevice(std::string* error_message) override;
+  void SetOnDeviceShutdownCallback(const base::Closure& callback) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ShellRuntimeAPIDelegate);