* Some texture parameters were not initialized correctly.
 * Binding points were not created for enableable texture extensions.

BUG=angleproject:1650
BUG=angleproject:1523

Change-Id: Id3436fe1dbb4069eafad97e722ac519a6b59e5db
Reviewed-on: https://chromium-review.googlesource.com/744446
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>