Refactor NotificationPlatformBridgeLinux

chrome/browser/notifications/notification_platform_bridge.h

 // Copyright 2016 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 CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_PLATFORM_BRIDGE_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_PLATFORM_BRIDGE_H_
 
 #include <memory>
 #include <set>
 #include <string>
@@ skipping 27 matching lines @@
   virtual void Close(const std::string& profile_id,
                      const std::string& notification_id) = 0;
 
   // Writes the ids of all currently displaying notifications and posts
   // |callback| with the result.
   virtual void GetDisplayed(
       const std::string& profile_id,
       bool incognito,
       const GetDisplayedNotificationsCallback& callback) const = 0;
 
+  // Calls |callback| once |this| is initialized.  The argument is
+  // true if |this| is ready to be used and false if initialization
+  // failed.  |callback| may be called directly or from a posted task.

[Peter Beverloo, 2017/04/26 13:53:36]

nit: no double spaces. I don't mind what you do in the _linux.* files, but let's
stay consistent elsewhere.

[Tom (Use chromium acct), 2017/04/26 17:56:53]

Done.

+  virtual void SetReadyCallback(NotificationBridgeReadyCallback callback) = 0;
+
  protected:
   NotificationPlatformBridge() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NotificationPlatformBridge);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_PLATFORM_BRIDGE_H_