Vulkan: Create tests to validate we created the pipeline when needed 1- Link program with a shader and draw with it, relink with another shader and draw again. 2- Release program that is reading from a uniform. Bug: angleproject:2397 Change-Id: Icb4211c5cf71efaf41833d9d5afd83ce8410c598 Reviewed-on: https://chromium-review.googlesource.com/1028580 Commit-Queue: Luc Ferron <lucferron@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>