commit a3ec9613d2386591660c570754b4bddd0c888a3b
author Gabriel Charette <gab@chromium.org> Thu Dec 14 17:22:40 2017
committer Commit Bot <commit-bot@chromium.org> Thu Dec 14 17:22:40 2017
tree 2615280ec89aa8218d77342ec7e48d25c29d57f3
parent 3d54411f1adccb400bed8374c5f2d05441b12b8e

Replace RunLoop's Delegate::Client by a ShouldQuitWhenIdleCallback.

The Client interface was diluted down to a single method at this point.
Different implementations of overriding Delegate's Run() methods will
need different behaviors from ShouldQuitWhenIdle(). Making it easily
overrridable is key.

One such example behaviour is when overriding a MessageLoopForUI/IO.
When waiting inside a Run() with no more tasks, control needs to
remain in the hands of the overridden MessageLoop as it may receive
work first (from the system) and therefore shouldn't quit-when-idle
when the overriding Delegate is out of work (the overriding Delegate
can let it know to wake by posting a task to it if it gets work
first).

R=thestig@chromium.org

Bug: 708584
Change-Id: I27a449bc3be5858b0e8d4d6482714523ad5e2b67
Reviewed-on: https://chromium-review.googlesource.com/817962
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524097}