GitLab

Switch the tab_switching benchmark to use the new TBMv2 metric for
measuring tab-switching latency.

BUG=802104

Change-Id: I7ab9610811b842feacf3a28845a2b267de4bfd20
Reviewed-on: https://chromium-review.googlesource.com/886003Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531912}