GitLab

Record time spent on reading partner bookmarks, since this is part of
the critical path of showing bookmark UI.

Bug: 787132
Change-Id: I8aa68436b0d762d644691992bde0e2df095259f0
Reviewed-on: https://chromium-review.googlesource.com/825004Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524601}