UMA for Notification action buttons

chrome/browser/notifications/platform_notification_service_impl.cc

 // Copyright 2014 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/platform_notification_service_impl.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/user_metrics_action.h"
 #include "base/prefs/pref_service.h"
@@ skipping 100 matching lines @@
                                 kInvalidRenderProcessId);
 
   // TODO(peter): Change this to a CHECK() when Issue 555572 is resolved.
   // Also change this method to be const again.
   if (permission != blink::WebNotificationPermissionAllowed) {
     content::RecordAction(base::UserMetricsAction(
         "Notifications.Persistent.ClickedWithoutPermission"));
     return;
   }
 
-  content::RecordAction(
-      base::UserMetricsAction("Notifications.Persistent.Clicked"));
+  if (action_index == -1) {
+    content::RecordAction(base::UserMetricsAction(
+        "Notifications.Persistent.Clicked"));
+  } else {
+    content::RecordAction(base::UserMetricsAction(
+        "Notifications.Persistent.ClickedActionButton"));
+  }
 
   content::NotificationEventDispatcher::GetInstance()
       ->DispatchNotificationClickEvent(
             browser_context,
             persistent_notification_id,
             origin,
             action_index,
             base::Bind(&OnEventDispatchComplete));
 }
 
@@ skipping 325 matching lines @@
         extensions::ExtensionRegistry::Get(profile)->GetExtensionById(
             origin.host(), extensions::ExtensionRegistry::EVERYTHING);
     DCHECK(extension);
 
     return base::UTF8ToUTF16(extension->name());
   }
 #endif
 
   return base::string16();
 }