This avoids the need to consult the resource maps twice per bind.
It improves performance in applications which call Bind* often.

BUG=angleproject:1333

Change-Id: I7b733cc89e50e24a2e38a2eb2dc7fd658d612e27
Reviewed-on: https://chromium-review.googlesource.com/331386Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>