* Fix wrong internal format being passed to ValidateTexImageFormatCombination.
* Fix ValidateTexImageFormatCombination validating the format instead of
  internal format for general support.
* Fix support checks for format and type comparing with wrong format and
  type fields.
* Add an early-out in format and type check loop to reduce iterations.

BUG=angle:658

Change-Id: I05e1b9f58b2e5ac4b5e1c0fa5a45cf37fb6a4ccd
Reviewed-on: https://chromium-review.googlesource.com/210884Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>