Vulkan: Track the emulated texture buffer in command buffer ... instead of the original texture buffer, because the emulated one is the one that is actually being used. This removes the necessity to issue a hacky barrier after the emulation is done. Bug: angleproject:8128 Change-Id: Ibc812894204cc1b2c6147817674de44e9c7ba2f4 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4571701 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Auto-Submit: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Roman Lavrov <romanl@google.com> Reviewed-by: Charlie Lao <cclao@google.com>