This end2end test makes it easier to create/debug pre-rotation support for dFdx() & dFdy(). Bug: b/157476241 Change-Id: I6e6cc3a86c84d252a326a776d6b589662b08d1ec Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2220311Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Ian Elliott <ianelliott@google.com>
