Add validation state change test for draw framebuffer.
Add validation state change test for draw framebuffer.

This test covers feedback loops and invalid component types.

Bug: angleproject:2747
Change-Id: I3e3c762c5457afef59311f7c5843e464fa386cd6
Reviewed-on: https://chromium-review.googlesource.com/1174093
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Geoff Lang <b6fc25fe0362055230985c05cbfa8adb741ccc0f@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle