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Now that we reset the connection when nothing is focused we need to ack
any pending events.

BUG=681563
TEST=covered by test

Change-Id: I1fc3219a04a49f911434ea8def7d9eca223c4ab6
Reviewed-on: https://chromium-review.googlesource.com/1089885Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565100}