This can help is track startup time regressions within ANGLE.

BUG=436191
BUG=angleproject:944

Change-Id: I73cf2449661b909dced4ddc11957037ed5535fc0
Reviewed-on: https://chromium-review.googlesource.com/272613Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>