Use p.is_new signal and set it manually with rietveld patches.
Add regression test for +x.

R=dpranke@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/7054057

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@87858 0039d316-1c4b-4281-b951-d872f2087c98