Update Textures immediately on program change. Instead of deferring this work, we can process it immediately. We have access to the information we need in the prior and current states so can optimize the update more effectively. Bug: angleproject:2763 Change-Id: I77482b0ea490fddf403ccc4a4f32665301fd6e7a Reviewed-on: https://chromium-review.googlesource.com/c/1254042 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>