tree db5958189f9b9605e8e9a174c716f404a9aa1017
parent d4b6e25fdda0bd19d65ba3babbaac73a10cfeb8f
author Tianjie Xu <xunchang@google.com> 1510792001 -0800
committer Tianjie Xu <xunchang@google.com> 1510814139 -0800

Switch imgdiff to libbase logging

Also add a verbose option. And we won't print messages of 'info'
severity unless '-v' is present.

Test: run imgdiff and check the logs.
Change-Id: I1b90874baea8e72e2a2323a0b63bc5d35e653e6b