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This CL improves/adds some debugging info in case of failures in
the chain of creation of a SharedImage; it helped debugging the
Issue mentioned below.

Bug: 1015435
Change-Id: I2c80c6879a4a6b54ce80e76929d1e52b29cf6dff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869719
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708230}