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With this change, I have corrected the aspect ratio of our radial
gradients. That is, they are no longer elliptical when the quad is
rectangular. I have also made it possible to set a different center
point for the gradient.

Bug: 817620
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_vr;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I2d3a754fb1b8235ff454ea5148dfd9bbfde69068
Reviewed-on: https://chromium-review.googlesource.com/958037Reviewed-by: Biao She <bshe@chromium.org>
Commit-Queue: Ian Vollick <vollick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542607}