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wrapped_sk_image()->GetSkSurface() may return nullptr if the deive is
lost, so we need to check the result before using it to avoid crash.

This CL also improves SharedImageAHB to recreate SkSurface, if surface
properties are changed. And it also resets the canvas when write access
is done.

Bug: None
Change-Id: Ic9a7a966ac7063a74f650c1b04c2ee6ba475d918
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2145467
Auto-Submit: Peng Huang <penghuang@chromium.org>
Reviewed-by: Jonathan Backer <backer@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759251}