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This CL adds some more logging around scoped_skia_write_access_ since
we suspect that it being null causes a rare crash on Chrome OS. The
member can be null for a number of reasons, so let's add some LOGs
after each.

This crash also happens rarely on Android which also uses the
BufferQueue output surface, so these logging statements can probably
help there as well.

Bug: 1169364
Change-Id: Ia61510da3b8fb92166aed1edbb3bd33a262378d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2645151Reviewed-by: Peng Huang <penghuang@chromium.org>
Commit-Queue: Brian Ho <hob@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846361}