Useful tool for perf for the ANGLE team.

Bug: None
Change-Id: I78c3b7d8a4e2a6d19f6b2ea2c8e6d67b2a4dc0af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1778979Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>