Make owners check optional.

BUG=None
TEST=None
R=thomasvl@google.com
Review URL: http://codereview.chromium.org/6728031

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@80043 0039d316-1c4b-4281-b951-d872f2087c98

presubmit_canned_checks.py

@@ -838,7 +838,8 @@ def _CheckSingletonInHeaders(input_api, output_api, source_file_filter):
 
 def PanProjectChecks(input_api, output_api,
                      excluded_paths=None, text_files=None,
-                     license_header=None, project_name=None):
+                     license_header=None, project_name=None,
+                     owners_check=True):
   """Checks that ALL chromium orbit projects should use.
 
   These are checks to be run on all Chromium orbit project, including:
@@ -884,6 +885,7 @@ def PanProjectChecks(input_api, output_api,
   text_files = lambda x: input_api.FilterSourceFile(x, black_list=black_list,
                                                     white_list=white_list)
 
+  if owners_check:
     results.extend(input_api.canned_checks.CheckOwners(
         input_api, output_api, source_file_filter=sources))