Vulkan:Migrate timer sync functions to one-off cmd buffer ContextVk's getTimestamp() and synchronizeCpuGpuTime() were the two places that mCommandQueue was used outside of processing SecondaryCommandBuffers. Migrating those functions to use the one- off command buffer instead. This will allow for the removal of mCommandQueue from ContextVk as we migrate it to RendererVk instead for threading phase2 development. Bug: b/154030730 Change-Id: Ic00ce56739dadcdc4b5a1b1839e0e18603bfe0eb Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2209312 Reviewed-by: Charlie Lao <cclao@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Tobin Ehlis <tobine@google.com>