Add GrCap check for whether we can do a copy or not, and implement in Vk backend

Today, we only know if we fail a copy during the flush so we have no
way to cleanly handle a failed copy. This will allow us to know if we'll
fail a copy during recording and allow us to do some appropriate fallback
and/or dropping of the draw.

Bug: skia:
Change-Id: I38f209dbd4ebb4e762210b4609147d4b0a1b01b1
Reviewed-on: https://skia-review.googlesource.com/123560
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>

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