Don't issue try jobs for OWNERS-only changes.

BUG=None
R=maruel@chromium.org
TEST=PRESUBMIT_test.py, less needless try jobs.
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/11830057

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@176192 0039d316-1c4b-4281-b951-d872f2087c98

PRESUBMIT.py

@@ -829,7 +829,7 @@ def CheckChangeOnCommit(input_api, output_api):
 def GetPreferredTrySlaves(project, change):
   files = change.LocalPaths()
 
-  if not files:
+  if not files or all(re.search(r'[\\/]OWNERS$', f) for f in files):
     return []
 
   if all(re.search('\.(m|mm)$|(^|[/_])mac[/_.]', f) for f in files):

PRESUBMIT_test.py

@@ -60,6 +60,14 @@ class MockFile(object):
     return self._local_path
 
 
+class MockChange(object):
+  def __init__(self, changed_files):
+    self._changed_files = changed_files
+
+  def LocalPaths(self):
+    return self._changed_files
+
+
 class IncludeOrderTest(unittest.TestCase):
   def testSystemHeaderOrder(self):
     scope = [(1, '#include <csystem.h>'),
@@ -339,6 +347,14 @@ class BadExtensionsTest(unittest.TestCase):
     results = PRESUBMIT._CheckPatchFiles(mock_input_api, MockOutputApi())
     self.assertEqual(0, len(results))
 
+  def testOnlyOwnersFiles(self):
+    mock_change = MockChange([
+      'some/path/OWNERS',
+      'A\Windows\Path\OWNERS',
+    ])
+    results = PRESUBMIT.GetPreferredTrySlaves(None, mock_change)
+    self.assertEqual(0, len(results))
+
 
 if __name__ == '__main__':
   unittest.main()