Input Delay: Exclude pointerCancel and pointerCausedUaAction

This CL resets the pending pointerdown information in
InteractiveDetector when a pointerCancel or pointerCausedUaAction are
detected because those indicate that scrolls have happened. This CL also
changes the UMA and UKM metrics affected by this change by adding a 2 at
the end of the histogram names.

Bug: 924278
Change-Id: I4b42e9478c74d9ba42b77170800b6267151c91e8
Reviewed-on: https://chromium-review.googlesource.com/c/1427924
Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
Reviewed-by: Steve Kobes <skobes@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Reviewed-by: Bryan McQuade <bmcquade@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625389}
11 files changed