BUG=angleproject:1161

This is a continuation of the dirty bit refactor

Change-Id: I101f415094dd406f6b0a40cb260f1cbbfec7b62c
Reviewed-on: https://chromium-review.googlesource.com/313249Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Tryjob-Request: Dian Xiang <dianx@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Dian Xiang <dianx@google.com>