Due to a bug in Adreno glTexImage2D with GL_UNPACK_SKIP_IMAGES.

BUG=angleproject:1429
TEST=Texture2DTestES3.UnpackSkipImages2D

Change-Id: Iccb4cc968915a623f0aed099b81e759c6e4343f7
Reviewed-on: https://chromium-review.googlesource.com/356494Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>