CHROMIUM: add timestamps to common log points

Since portage runs for long periods of time, it can be hard to
get quick feedback as to how long steps are taking.  Add some
minor timestamps at common log points to help out.

BUG=chromium:996480
TEST=build works w/more timestamps

Change-Id: Ie1aa53594fca89cfe7193edf1c9c54a001efa116
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/portage_tool/+/1791264
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
2 files changed