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GL_RG8_EXT is part of GL_EXT_texture_rg which is an ES2 extension, so we
must follow ES2 semantics like GL_R8_EXT i.e. internal format must match
data format. Just something I noticed while doing some related work,
probably doesn't matter in practice if we're not creating RG8 textures
with glTexImage2D, etc.

Bug: 1116101
Change-Id: If6042f2432eec13df6b2d27602d87674e19cc78d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2629665Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Auto-Submit: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843860}