Also downgrades several Vulkan UNIMPLEMENTED() to WARN().
Also downgrades a couple D3D-specific errors to warnings.
Also downgrades an undefined behaviour integer clear error to warning.
Also includes suppressions for failing D3D11 ES 3.1 SSBO tests.
Also includes suppressions for failing Android GLES format tests.
Also includes suppressions for failing Android Vulkan buffer tests.

Bug: angleproject:2552
Bug: angleproject:2567
Bug: angleproject:1951
Bug: angleproject:2405
Change-Id: Ie619085021d42012cd578b669f7ff4252ca41a58
Reviewed-on: https://chromium-review.googlesource.com/1062791
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>