rebaseline_server: add more timing and progress info to server-side log

(SkipBuildbotRuns)
BUG=skia:1941
NOTRY=True
NOTREECHECKS=True
R=bsalomon@google.com

Author: epoger@google.com

Review URL: https://codereview.chromium.org/105213007

git-svn-id: http://skia.googlecode.com/svn/trunk@12777 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed