Save the oauth client id used in App Notification setup

chrome/browser/extensions/extension_prefs.h

Index: chrome/browser/extensions/extension_prefs.h
diff --git a/chrome/browser/extensions/extension_prefs.h b/chrome/browser/extensions/extension_prefs.h
index d7760a76d98a7210d7a0aae4bbb75cdd10689c7c..75d7068d2694b71316f67439b3bd48d22458e284 100644
--- a/chrome/browser/extensions/extension_prefs.h
+++ b/chrome/browser/extensions/extension_prefs.h
@@ -171,10 +171,10 @@ class ExtensionPrefs : public ExtensionContentSettingsStore::Observer {
   // reset it. Don't call it unless you mean it!
   bool SetAlertSystemFirstRun();
 
-  // Whether app notifications setup is done for the given app.
-  bool IsAppNotificationSetupDone(const std::string& extension_id) const;
-  void SetAppNotificationSetupDone(const std::string& extension_id,
-      bool value);
+  // The oauth client id used for app notification setup, if any.
+  std::string GetAppNotificationClientId(const std::string& extension_id) const;
+  void SetAppNotificationClientId(const std::string& extension_id,
+                                  const std::string& oauth_client_id);
 
   // Whether app notifications are disabled for the given app.
   bool IsAppNotificationDisabled(const std::string& extension_id) const;