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In the context of replacing SwiftShader GL with SwANGLE (ANGLE +
SwiftShader Vulkan), which doesn't plan on adding support for
rectangle textures, make sure tests which use rectangle textures
are skipped when the feature is not supported.

Bug: chromium:1061151
Change-Id: Ie0467a5aecdd024bcbb28c5e058d2588cc3bb5e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2418976Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: Alexis Hétu <sugoi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808455}