Pass ContextVk instead of gl::Context to internal methods Minor cleanup to change funciton signatures of vulkan specific methods in MemoryObjectVk & SemaphoreVk. Bug: angleproject:2475 Change-Id: I230664548004ebc48b559e0f25264ea948ce5a1f Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2067500 Commit-Queue: Michael Spang <spang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>