Re-enable Event.Latency.HitTest* histograms with new ownership

The Event.Latency.HitTest* histograms were removed due to their noisy
nature. But the Rendering Core team looks at these and has used them
to find regressions, so we want them back, and we will own them.

This patch essentially reverts commit
ab878a2f504bde1cfd53496f62c15716fa225218 with additional changes to
owners in the histogram file.

Bug: None
Change-Id: Id2437e84510d05ec345e5ba5d7bc1154de38afd5
Reviewed-on: https://chromium-review.googlesource.com/c/1409903
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Stephen Chenney <schenney@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623562}
2 files changed