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Measure the time it takes for the extension to handle a key event.

Bug: 1009903
Change-Id: I4099ab7071d0cbbb414e534b3790d36763553d14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832854Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Keith Lee <keithlee@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702652}