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This is a follow-up patch to CL 1724669 [1], which adds to the
previously introduced UMA metrics keeping track of the reasons
BookmarkSpecifics are being deemed invalid. This patch logs as well the
case where an invalid GUID was found in the specifics.

Bug: 988451
Change-Id: Ifd52a28d4646b6333c13de63827aa33294b880b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1811254Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Commit-Queue: Pauline Leitao <psivieroleitao@google.com>
Cr-Commit-Position: refs/heads/master@{#697962}