[test] Fix deterministic test shards.

tools/testrunner/local/testsuite.py

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * 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
@@ skipping 298 matching lines @@
       raise Exception("Test executable failed to list the tests.")
     tests = []
     test_case = ''
     for line in output.stdout.splitlines():
       test_desc = line.strip().split()[0]
       if test_desc.endswith('.'):
         test_case = test_desc
       elif test_case and test_desc:
         test = testcase.TestCase(self, test_case + test_desc)
         tests.append(test)
-    tests.sort()
+    tests.sort(key=lambda t: t.path)
     return tests
 
   def GetFlagsForTestCase(self, testcase, context):
     return (testcase.flags + ["--gtest_filter=" + testcase.path] +
             ["--gtest_random_seed=%s" % context.random_seed] +
             ["--gtest_print_time=0"] +
             context.mode_flags)
 
   def _VariantGeneratorFactory(self):
     return StandardVariantGenerator
 
   def shell(self):
     return self.name