The user will get an idea of what data is sent.

Getting the current working directory is useful to know what checkout was used.

the repr(last_tb) call was stripping off a lot of useful information for
debugging.

TEST=none
BUG=none

Review URL: http://codereview.chromium.org/3384020

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@60339 0039d316-1c4b-4281-b951-d872f2087c98