Fix npot Texture level 0 validation. We were rejecting npot textures for level 0, even though it is valid in GLES 2 for non-mipped textures to have npot size. BUG=381495 Change-Id: Iacc3ab50d6487ecba804fd8963aa0a2ada2f1cae Reviewed-on: https://chromium-review.googlesource.com/205220 Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Nicolas Capens <nicolascapens@chromium.org>