Making license presubmit check more verbose.

BUG=None
TEST=None
R=dpranke@chromium.org
Review URL: http://codereview.chromium.org/6768006

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@79644 0039d316-1c4b-4281-b951-d872f2087c98

presubmit_canned_checks.py

@@ -309,6 +309,7 @@ def CheckLicense(input_api, output_api, license_re, source_file_filter=None,
     else:
       res_type = output_api.PresubmitNotifyResult
     return [res_type(
+        'License must match:\n%s\n' % license_re.pattern +
         'Found a bad license header in these files:', items=bad_files)]
   return []