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What:
PrioritizedTaskRunner currently runs its tasks (from RunTaskAndReply) in prioritized order but not the replies. This CL adds a priority queue for replies to run in order as well.

Why:
At least for the cache, the reply task is equally important to the posted task and should run in priority order.


Bug: 856674
Change-Id: Icea37adb96891473292e0c38805c42e84f9d4f5f
Reviewed-on: https://chromium-review.googlesource.com/1114921Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Commit-Queue: Josh Karlin <jkarlin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570781}