Refactor StateChangeTests to use essl1_shaders instead Bug: angleproject:2474 Change-Id: Ia558c2e266422f8f8b55523c9542379688a7058d Reviewed-on: https://chromium-review.googlesource.com/1037164 Commit-Queue: Luc Ferron <lucferron@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>