ui: Fix TEXTURE_RECTANGLE support in GLImage unit tests.
Sampling from texture with TEXTURE_RECTANGLE target requires
unnormalized texture coordinates. Prior to this change
all texture sampling would be done from a single texel instead
of the whole texture when using TEXTURE_RECTANGLE target.
This change also includes some cleanups to make GLImage unit
test code more consistent.
BUG=
TEST=gl_unittests --gtest_filter=GLImage*
Review URL: https://codereview.chromium.org/1708733002
Cr-Commit-Position: refs/heads/master@{#375993}
2 files changed
