Improve Progress.update_item() to make it simpler to understand.

Make raw output explicit instead of being a side effect of index=False.
Change all defaults to False so only True arguments have to be specified.
Use named arguments at all call sites to make the code clearer.

R=vadimsh@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/25373007

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/swarm_client@226271 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed