histograms: Update expires_after= and add <owner>s

A few histograms are still interesting so this CL kicks the
expires_after can down the road; it also takes the chance to
extend the owners with me and the chromeos-gfx@ public list.

Bug: 975264, 975422, 975572
Change-Id: I993a5725b74f11c05e505ac9b57067d7c753eabb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1672625
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672224}
1 file changed