Add an XPC service to handle alert notifications on mac

chrome/browser/notifications/notification_platform_bridge_mac.mm

 // Copyright 2015 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.
 
 #include "chrome/browser/notifications/notification_platform_bridge_mac.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 28 matching lines @@
 @class NSUserNotificationCenter;
 
 // The mapping from web notifications to NsUserNotification works as follows
 
 // notification#title in NSUserNotification.title
 // notification#message in NSUserNotification.informativeText
 // notification#context_message in NSUserNotification.subtitle
 // notification#tag in NSUserNotification.identifier (10.9)
 // notification#icon in NSUserNotification.contentImage (10.9)
 // Site settings button is implemented as NSUserNotification's action button
-// Not possible to implement:
+// Not easy to implement:
 // -notification.requireInteraction
 // -The event associated to the close button
 
 // TODO(miguelg) implement the following features
 // - Sound names can be implemented by setting soundName in NSUserNotification
 //   NSUserNotificationDefaultSoundName gives you the platform default.
 
 namespace {
 
 // Callback to run once the profile has been loaded in order to perform a
@@ skipping 367 matching lines @@
   [[xpcConnection_ remoteObjectProxy] deliverNotification:data];
 }
 
 // NotificationReply implementation
 - (void)notificationClick:(NSDictionary*)notificationResponseData {
   NotificationPlatformBridgeMac::ProcessNotificationResponse(
       notificationResponseData);
 }
 
 @end