Adds more profiling help for startup shader compiles in Chrome.

BUG=510151

Change-Id: I550b55b1280542d1eaab9ed6166387b663cafffe
Reviewed-on: https://chromium-review.googlesource.com/290091Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>