There are currently some failures on the Chromium GPU FYI bots. The
failing machine is using an Intel HD 3000, and the group of failing
tests are the TextureTest.CopySubImageFloat_* group. I'm unable
to repro these failures, but disable the tests until we can fix them.

Also clean up our method of determining Renderer properties in
ANGLETest.

BUG=angle:850

Change-Id: I444b9d3497ea635fbd8957ac243b16c822c19d06
Reviewed-on: https://chromium-review.googlesource.com/244781Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Nicolas Capens <capn@chromium.org>