The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/06f33f6fa8d71e31838103a0e12f95e8420510d2

commit 06f33f6fa8d71e31838103a0e12f95e8420510d2
Author: leon.han <leon.han@intel.com>
Date: Thu May 11 05:46:54 2017

[ServiceWorker] waitUntil() should wait until all promises got resolved/rejected.

Spec: https://w3c.github.io/ServiceWorker/#wait-until-method

For multiple waitUntil() pending promises, even if some one got rejected
while some others are still pending at the same time, we should continue
waiting, until all pending promises completed(resolved or rejected).

BUG= 719850 
TEST=blink_tests
external/wpt/service-workers/service-worker/extendable-event-waituntil.https.html
TBR=kinuko@chromium.org

Review-Url: https://codereview.chromium.org/2867023002
Cr-Commit-Position: refs/heads/master@{#470828}

[delete] https://crrev.com/6156f7b21c2555d4ce52cecff7f5851ebb57652e/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/extendable-event-waituntil.https-expected.txt
[modify] https://crrev.com/06f33f6fa8d71e31838103a0e12f95e8420510d2/third_party/WebKit/Source/modules/serviceworkers/WaitUntilObserver.cpp
[modify] https://crrev.com/06f33f6fa8d71e31838103a0e12f95e8420510d2/third_party/WebKit/Source/modules/serviceworkers/WaitUntilObserver.h
[modify] https://crrev.com/06f33f6fa8d71e31838103a0e12f95e8420510d2/third_party/WebKit/Source/web/ServiceWorkerGlobalScopeProxy.cpp

Thanks for filing and fixing!

 Issue 709591  has been merged into this issue.