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MontionNotify XEvents coalescing logic has been accidentally lost after
the PlatformEvent migration CLs have landed (crbug.com/965991), what
leads to some performance hit/regressions. This patch adds it back as an
attempt to address regressions reported at crbug.com/1051325. Even
though the numbers the report seem quite noisy and unstable, [1] shows
that this was the major cause for such perf regression.

R=thomasanderson@chromium.org

[1] https://pinpoint-dot-chromeperf.appspot.com/job/172c2f5a620000

Bug: 1051325, 965991
Change-Id: Ib5d06867d97633c3593584222571b8d910deb304
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062098Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#742892}