GitLab

Allow an optional RepeatingCallback<std::string()> to be supplied to
ScopedRunLoopTimeout, to provide an additional message string in case of
timeout.

Update base::test::TaskEnvironment to have DescribeAllPendingTasks'
output appending to the timeout message.

Bug: 1021777
Change-Id: I32ff686924aea50cc56b6f103696bdbde7e8d8fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062984
Auto-Submit: Wez <wez@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742679}