commit a0a01db6cee762f21b59648a6a4e0c2017b2f934
author alexclarke <alexclarke@chromium.org> Mon Nov 23 11:10:27 2015
committer Commit bot <commit-bot@chromium.org> Mon Nov 23 11:11:23 2015
tree befd6ac444dc4d16e17b36cc4175963ad89b794e
parent a59c14f4aededac3580756cec407d587f3d4351b

Reduce the number of delayed tasks on chromium run loop

Previously if there were N distinct delayed times for dealyed tasks
posted to the scheduler, there would be N delayed tasks posted on the
chromium run loop.  We only really need to post timers for the next
delayed task.  This patch implements that. Caveat: because it's not
possible to cancel tasks posted to the chromium runloop, we will still
have more than one task outstanding if delayed tasks get posted in
reverse order.

BUG=510398, 546953

Review URL: https://codereview.chromium.org/1468443002

Cr-Commit-Position: refs/heads/master@{#361086}