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Suppose VulkanSwapChain::PostSubBuffer() and
VulkanSwapChain::PostSubBufferAsync() should not be called, if previous
call is pending. However we got some crash reports during shutdown,
seems they are called with pending PostSubBuffer(). To fix the problem,
we will always call WaitUntilPostSubBufferAsyncFinished() to make sure
previous request is finished.

Bug: 1155507
Change-Id: Id2456ea160c0fe0ebefabedbe2d7e915f5c97a34
Cq-Include-Trybots: luci.chromium.try:gpu-fyi-try-android-p-pixel-2-skv-32,gpu-fyi-try-linux-intel-skv,gpu-fyi-try-linux-nvidia-skv
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601229Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Auto-Submit: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839138}