GitLab

Instead of eagerly flushing commands whenever there is a pending
callback, enqueue a microtask if one hasn't been already, to
perform a flush if it is still needed.
This optimization prevents excess IPC flushes.

Bug: none
Change-Id: Icc48978fdc5d6a54ef61f9379bb4c78d3c75e08a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2380084Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803560}