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The backing (vkimage) of WrapperSkImage could be still used by some
submitted but not finished vulkan tasks, when the WrapperSkImage is
being destroyed. So we need use VulkanFenceHelper to release the backing.

Bug: 968727
Change-Id: I8750cb9e0ddc9daea5a04bba3335e81554e45f4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1651034
Commit-Queue: Peng Huang <penghuang@chromium.org>
Reviewed-by: Jonathan Backer <backer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#668567}