Pass Context to VertexArray and Framebuffer syncstate. This will enable more Vulkan-friendly idioms like clearing the vulkan pipeline caches correctly on GL state changes immediately because we have access to the ContextVk. BUG=angleproject:1898 Change-Id: I16c848d8abdde8e26a38d384e565cec8548a66d0 Reviewed-on: https://chromium-review.googlesource.com/459079 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>