Vulkan: 3 Final bugfixes to enable all dEQP depth_stencil tests - The scissor when clearing should not be clipped against the viewport. - The render pass was created with a render area == to the current viewport, but the viewport can be changed by the tests multiple times per render pass, so we should always keep the renderArea to the full framebuffer instead. - Enables an additional 163 dEQP tests. - We should clip the scissor to the framebuffer dimensions instead of the viewport. Its valid to do a cmdClearAttachments outside the viewport, but not outside the full framebuffer's dimension. Bug: angleproject:2443 Change-Id: I79168e9f0c782d6dec77470fef938b85ad7a8794 Reviewed-on: https://chromium-review.googlesource.com/998448 Commit-Queue: Luc Ferron <lucferron@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>