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If a client makes rapid index updates that are intrinsically async,
there may be a race condition so that updates are not done in the
right order. This cl checks ongoing updates and queue later updates
when necessary.

Bug: 1133931
Change-Id: I0edbf57f2039b8a4dc51b75292788f22464eef9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440320
Commit-Queue: Jia Meng <jiameng@chromium.org>
Reviewed-by: Thanh Nguyen <thanhdng@chromium.org>
Reviewed-by: Andrew Moylan <amoylan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812923}