The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/df66003302472598012e7b88da3b974a5025c31f

commit df66003302472598012e7b88da3b974a5025c31f
Author: David Trainor <dtrainor@chromium.org>
Date: Thu Jul 13 00:20:46 2017

Expose DownloadService failure to Clients

Add the capability for clients to be notified when the service fails
initialization.

Bug:  735347 
Change-Id: Id274a68c76893ae2286f1f9945a1255d8b592aaa
Reviewed-on: https://chromium-review.googlesource.com/542476
Reviewed-by: Jian Li <jianli@chromium.org>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Commit-Queue: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486179}
[modify] https://crrev.com/df66003302472598012e7b88da3b974a5025c31f/chrome/browser/offline_pages/prefetch/offline_prefetch_download_client.cc
[modify] https://crrev.com/df66003302472598012e7b88da3b974a5025c31f/chrome/browser/offline_pages/prefetch/offline_prefetch_download_client.h
[modify] https://crrev.com/df66003302472598012e7b88da3b974a5025c31f/components/download/internal/controller_impl.cc
[modify] https://crrev.com/df66003302472598012e7b88da3b974a5025c31f/components/download/internal/controller_impl.h
[modify] https://crrev.com/df66003302472598012e7b88da3b974a5025c31f/components/download/internal/controller_impl_unittest.cc
[modify] https://crrev.com/df66003302472598012e7b88da3b974a5025c31f/components/download/internal/test/empty_client.cc
[modify] https://crrev.com/df66003302472598012e7b88da3b974a5025c31f/components/download/internal/test/empty_client.h
[modify] https://crrev.com/df66003302472598012e7b88da3b974a5025c31f/components/download/internal/test/mock_client.h
[modify] https://crrev.com/df66003302472598012e7b88da3b974a5025c31f/components/download/public/client.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/29cb248850060bd37f4105bcd61be7c18c04d599

commit 29cb248850060bd37f4105bcd61be7c18c04d599
Author: Patrik Höglund <phoglund@chromium.org>
Date: Tue Nov 07 13:32:12 2017

Rewriting wait-for-video functions to use promises.

The end goal here is to get rid of addExpectedEvent() / eventOccurred()
and replace with promises, which is more standard. I hope we will end
up getting rid of all the callback complexity and replacing with
straightforward chains of promises.

This also harmonizes us with the new browser tests from kerl@, which
uses promises.

The next CL will try to get rid of the waitFor functions. Further CLs
will eliminate other use of the addExpectedEvent etc functions.

Bug:  735347 
Change-Id: Ibc6dd5ec15aed21fa7f52b7fcc83f5f4d12fe134
Reviewed-on: https://chromium-review.googlesource.com/747626
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Patrik Höglund <phoglund@chromium.org>
Cr-Commit-Position: refs/heads/master@{#514458}
[modify] https://crrev.com/29cb248850060bd37f4105bcd61be7c18c04d599/content/test/data/media/getusermedia-depth-capture.html
[modify] https://crrev.com/29cb248850060bd37f4105bcd61be7c18c04d599/content/test/data/media/getusermedia-real-webcam.html
[modify] https://crrev.com/29cb248850060bd37f4105bcd61be7c18c04d599/content/test/data/media/getusermedia.html
[modify] https://crrev.com/29cb248850060bd37f4105bcd61be7c18c04d599/content/test/data/media/peerconnection-call.html
[modify] https://crrev.com/29cb248850060bd37f4105bcd61be7c18c04d599/content/test/data/media/video_capture_test.html
[modify] https://crrev.com/29cb248850060bd37f4105bcd61be7c18c04d599/content/test/data/media/webrtc_test_utilities.js