Vulkan: Decouple RendererVk from egl::BlobCache The new vk::GlobalOps class abstracts access to egl::BlobCache. This is a step towards decoupling RendererVk from egl::Display for direct use with OpenCL. Bug: angleproject:8564 Change-Id: I7b3910254430df74b889759639da1749735584a7 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5332082 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org> Auto-Submit: Shahbaz Youssefi <syoussefi@chromium.org>