Handle invalid format/type in texture uploading when FlipY/PremultiplyAlpha is set.

Currently if uploading from ArrayBuffer, NOTREACHED() will be hit in such situations
and in Release build, after hitting NOTREACHED() statement, unintended code path is taken.

BUG=765469
TEST=webgl_conformance
R=kbr@chromium.org

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Icf1ab03723b6c13595bd6c4dbc4e5fa40fdf9d96
Reviewed-on: https://chromium-review.googlesource.com/685487
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504568}
2 files changed