Introduce a new API to handle native notification clicks

chrome/browser/ui/cocoa/notifications/notification_response_builder_mac.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/notifications/notification_response_builder_mac.h"
 
 #include "base/logging.h"
 #include "chrome/browser/ui/cocoa/notifications/notification_constants_mac.h"
 
 namespace {
@@ skipping 25 matching lines @@
 
   DCHECK([[notification userInfo]
       objectForKey:notification_constants::kNotificationProfileId]);
   NSString* profileId = [[notification userInfo]
       objectForKey:notification_constants::kNotificationProfileId];
 
   DCHECK([[notification userInfo]
       objectForKey:notification_constants::kNotificationIncognito]);
   NSNumber* incognito = [[notification userInfo]
       objectForKey:notification_constants::kNotificationIncognito];
+  NSNumber* notificationType = [[notification userInfo]
+      objectForKey:notification_constants::kNotificationType];
 
   // Initialize operation and button index for the case where the
   // notification itself was clicked.
   NotificationOperation operation = NOTIFICATION_CLICK;
   int buttonIndex = -1;
 
   // Determine whether the user clicked on a button, and if they did, whether it
   // was a developer-provided button or the mandatory Settings button.
   if (notification.activationType ==
       NSUserNotificationActivationTypeActionButtonClicked) {
@@ skipping 25 matching lines @@
               ? -1
               : actionIndex.intValue;
     }
   }
 
   return @{
     notification_constants::kNotificationOrigin : origin,
     notification_constants::kNotificationId : notificationId,
     notification_constants::kNotificationProfileId : profileId,
     notification_constants::kNotificationIncognito : incognito,
-    notification_constants::kNotificationOperation :
-        [NSNumber numberWithInt:operation],
+    notification_constants::kNotificationType : notificationType,
+    notification_constants::
+    kNotificationOperation : [NSNumber numberWithInt:operation],
     notification_constants::
     kNotificationButtonIndex : [NSNumber numberWithInt:buttonIndex],
   };
 }
 
 @end