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There are currently no cross platform metrics for touch mode. This
adds a pair of actions logged at browser start and when the current
touch mode changes.

Change-Id: I67da675c8c7ce9f11d0d0b53bd13047bf35a2afb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2238363
Commit-Queue: Collin Baker <collinbaker@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779573}