Add --mode=noop so progress can be made while the builders are being reconfigured

tools/isolate/isolate_smoke_test.py

Index: tools/isolate/isolate_smoke_test.py
diff --git a/tools/isolate/isolate_smoke_test.py b/tools/isolate/isolate_smoke_test.py
index db62c630a646e82114596895015e8847d443b511..f2e7f25fda4a9be628c91f499f4322499184b921 100755
--- a/tools/isolate/isolate_smoke_test.py
+++ b/tools/isolate/isolate_smoke_test.py
@@ -223,7 +223,8 @@ class Isolate(unittest.TestCase):
     out = out[:out.index('')]
     modes = [re.match(r'^  (\w+) .+', l) for l in out]
     modes = tuple(m.group(1) for m in modes if m)
-    self.assertEquals(EXPECTED_MODES, modes)
+    # noop doesn't do anything so no point in testing it.
+    self.assertEquals(sorted(EXPECTED_MODES + ('noop',)), sorted(modes))
 
   def test_modes(self):
     # This is a bit redundant but make sure all combinations are tested.