Synchronize TextureGL internal state using the dirty bits.

TexturesBenchmark scores:
Before: 5051
After: 7639
Diff: +51.2%

BUG=angleproject:1386

Change-Id: Id04aef778a47175d1a284564495a646045855b4b
Reviewed-on: https://chromium-review.googlesource.com/393866
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>