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With this change, rects can now have individually configurable corner
radii. This does not apply to textured quads, and the utility for this
is not as clear.

(Also converts a few arguments to const refs and updates shadow to set
the corner radius automatically).

Bug: 782703
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Id49a1cce69dc59178c1b4a8ce15df8f8016bf709
Reviewed-on: https://chromium-review.googlesource.com/827026
Commit-Queue: Ian Vollick <vollick@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524094}