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This CL updates pedal logic to work with and without the button row
feature enabled. Pedals may attach to matches that also have tab-switch
and keyword buttons. ExecutePedal is used instead of OpenMatch when
the intent is to perform the pedal action.

Bug: 1046523
Change-Id: I5a46383ca716df2f41f21eec3ffcf2969e7ab593
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032189Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Orin Jaworski <orinj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737451}