Collecting statistics on iframe permissions use.

content/child/background_sync/background_sync_provider.cc

 // 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 "content/child/background_sync/background_sync_provider.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/child/background_sync/background_sync_type_converters.h"
 #include "content/child/service_worker/web_service_worker_registration_impl.h"
@@ skipping 256 matching lines @@
               blink::WebSyncPermissionStatusGranted));
           break;
         case PERMISSION_STATUS_DENIED:
           callbacks->onSuccess(new blink::WebSyncPermissionStatus(
               blink::WebSyncPermissionStatusDenied));
           break;
         case PERMISSION_STATUS_ASK:
           callbacks->onSuccess(new blink::WebSyncPermissionStatus(
               blink::WebSyncPermissionStatusPrompt));
           break;
+        case PERMISSION_STATUS_NUM:
+          break;

[jww, 2015/07/07 18:41:46]

Shouldn't this be a NOTREACHED?

[keenanb, 2015/07/07 21:02:59]

Done.

       }
       break;
     case BACKGROUND_SYNC_ERROR_NOT_FOUND:
       // This error should never be returned from
       // BackgroundSyncManager::GetPermissionStatus
       NOTREACHED();
       break;
     case BACKGROUND_SYNC_ERROR_STORAGE:
       callbacks->onError(
           new blink::WebSyncError(blink::WebSyncError::ErrorTypeUnknown,
@@ skipping 10 matching lines @@
 BackgroundSyncServicePtr&
 BackgroundSyncProvider::GetBackgroundSyncServicePtr() {
   if (!background_sync_service_.get()) {
     service_registry_->ConnectToRemoteService(
         mojo::GetProxy(&background_sync_service_));
   }
   return background_sync_service_;
 }
 
 }  // namespace content