[canvaskit] Performance tuning of GL calls

Don't check glerror on texture creation.

Initialize before texSubImage2D calls, especially for drawPath
(dramatic Firefox improvement).

Bug: skia:
Change-Id: Iec39fd84fffb886e5ecccf782fe75d419e4255d0
Reviewed-on: https://skia-review.googlesource.com/c/177893
Reviewed-by: Brian Salomon <bsalomon@google.com>
3 files changed