This consolidates all the state changes for shaders into
StateManager11.

BUG=angleproject:2052

Change-Id: I64dc3af5b0f1459442369e09f93a9ca8ce3232b3
Reviewed-on: https://chromium-review.googlesource.com/531796Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>