Adds a test for out-of-bounds writes resulting from clipping the copy
area to the size of the source framebuffer causing the destination area
to be out of bounds.
This causes a GL_INVALID_VALUE error according to the spec.

Bug: angleproject:3355
Change-Id: I39638daa9b0c03cc82a6dbf6cabd0027e32a8ea8
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1682111Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>