Mark shared and std140 UBOs as always active. This aligns ANGLE with the GL spec. With this fix, we pass all of the dEQP conformance tests in Functional / Uniform Buffer Object that don't rely on single buffers. BUG=angle:507 Change-Id: I6063a416e3f7ee6d5327d96850e3d0cc8521c817 Reviewed-on: https://chromium-review.googlesource.com/213506 Reviewed-by: Nicolas Capens <capn@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org>