run-bindings-tests: better error message

Tools/Scripts/webkitpy/bindings/main.py

 # Copyright (C) 2011 Google Inc.  All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 # 1. Redistributions of source code must retain the above copyright
 #    notice, this list of conditions and the following disclaimer.
 # 2. Redistributions in binary form must reproduce the above copyright
 #    notice, this list of conditions and the following disclaimer in the
 #    documentation and/or other materials provided with the distribution.
@@ skipping 10 matching lines @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
 
 import os
 import shutil
 import tempfile
 from webkitpy.common.checkout.scm.detection import detect_scm_system
 from webkitpy.common.system.executive import ScriptError
 
+PASS_MESSAGE = 'All tests PASS!'
+FAIL_MESSAGE = """Some tests FAIL!
+To update the reference files, execute:
+    run-bindings-tests --reset-results
+
+If the failures are not due to your changes, test results may be out of sync;
+please rebaseline them in a separate CL, after checking that tests fail in ToT.
+In CL, please set:
+NOTRY=true
+TBR=(someone in Source/bindings/OWNERS or WATCHLISTS:bindings)
+"""
+
 # Python compiler is incomplete; skip IDLs with unimplemented features
 SKIP_PYTHON = set([
     'TestActiveDOMObject.idl',
     'TestCallback.idl',
     'TestCustomAccessors.idl',
     'TestEvent.idl',
     'TestEventConstructor.idl',
     'TestEventTarget.idl',
     'TestException.idl',
     'TestExtendedEvent.idl',
@@ skipping 218 matching lines @@
         current_scm = detect_scm_system(os.curdir)
         os.chdir(os.path.join(current_scm.checkout_root, 'Source'))
 
         if self.generate_interface_dependencies():
             print 'Failed to generate interface dependencies file.'
             return -1
 
         all_tests_passed = self.run_tests()
         print
         if all_tests_passed:
-            print 'All tests PASS!'
+            print PASS_MESSAGE
             return 0
-        print 'Some tests FAIL! (To update the reference files, execute "run-bindings-tests --reset-results")'
+        print FAIL_MESSAGE
         return -1