Surface: Pass DisplayImpl to initialize and swap. In new back-ends (Vulkan) this will allow us to avoid storing a ref to the Renderer in the Surface class. BUG=angleproject:1319 Change-Id: I3b3f50893070d2993e4e91dd82ee539a083b3727 Reviewed-on: https://chromium-review.googlesource.com/419837 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>