GitLab

This adds a timer histogram for all PalmDetectionFilter->Filter
executions. We'll keep the timer whenever we change the underlying
filter implementation.

Adds a unit test that ensures the timer is populated.

Bug: 982118
Change-Id: I410ca0348bca9c556f4dff05ab5e228a1f09516d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824796Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Rob Schonberger <robsc@google.com>
Cr-Commit-Position: refs/heads/master@{#699983}