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Add callback in sharing message bridge to handle commit failures.

In next patch enum for specific errors will be added.

Bug: 1047123
Change-Id: I60451e080da0f23763cfad1240cd7d8a517b9f9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028769Reviewed-by: Alex Chau <alexchau@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Rushan Suleymanov <rushans@google.com>
Cr-Commit-Position: refs/heads/master@{#736929}