Vulkan: fix unsized internalformat depth sampling Many implementations provide OES_depth_texture behavior if the texture was specified with a non-sized format (e.g. GL_DEPTH_COMPONENT). This change implements that behavior for Vulkan and adds a couple of tests to verify it. Bug: angleproject:3890 Change-Id: I005b1eaa30db033f7d78a5cf2236aab7f442b7f5 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1764301 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>