Instead pass it around via methods. This makes the code a bit nicer.

BUG=angleproject:2044

Change-Id: I721e190a2ecde2b1a65e57debf419ee06a5dce29
Reviewed-on: https://chromium-review.googlesource.com/516385
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>