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A bunch of tests synthesize input events during testing, and this
ranges from unit-tests, interactive-ui-tests, telemetry tests etc.
During such tests, it is possible that chrome also receives unexpected
input events from the native system (e.g. if the window happens to show
up under the mouse cursor), causing unexpected failures (e.g. the
event-stream becomes invalid, or the tooltip shows up, etc.). Ignoring
all input events from the system during these tests should make these
tests more deterministic.

Bug: 766450, 883710
Change-Id: Ib7fccaf7a0495207cc9b097bfe25862cad302dc4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2176697Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Liviu Tinta <liviutinta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771020}