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Set mode to UPDATE for Mirror and log it. Needed for CL on logging which has a higher priority than the one where mode will actually be used. Use VLOG(1) to make variable and used somewhere.

Change-Id: I0eb3def674b510a5a5ca433f62540a027fa1cc25
Reviewed-on: https://chromium-review.googlesource.com/1255823
Commit-Queue: Valeriya Sinevich <valeriyas@google.com>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595829}