version-handler: Add session stat

We need to be able to inform the blob user of the readiness of blob data
and how large the contents are.

Change-Id: Ic90f6e344160b48e7e58cb009558586c7c2fab9b
Signe

version-handler: Add session stat

We need to be able to inform the blob user of the readiness of blob data
and how large the contents are.

Change-Id: Ic90f6e344160b48e7e58cb009558586c7c2fab9b
Signed-off-by: William A. Kennington III <wak@google.com>

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