Make fuzz-natives test generator more robust.

test/fuzz-natives/testcfg.py

 # Copyright 2014 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import os
 
 from testrunner.local import commands
 from testrunner.local import testsuite
 from testrunner.local import utils
 from testrunner.objects import testcase
@@ skipping 13 matching lines @@
          "try { var natives = %ListNatives();"
          "  for (var n in natives) { print(natives[n]); }"
          "} catch(e) {}"] +
         context.extra_flags)
     if output.exit_code != 0:
       print output.stdout
       print output.stderr
       assert False, "Failed to get natives list."
     tests = []
     for line in output.stdout.strip().split():
-      (name, argc) = line.split(",")
-      flags = ["--allow-natives-syntax",
-               "-e", "var NAME = '%s', ARGC = %s;" % (name, argc)]
-      test = testcase.TestCase(self, name, flags)
-      tests.append(test)
+      try:
+        (name, argc) = line.split(",")
+        flags = ["--allow-natives-syntax",
+                 "-e", "var NAME = '%s', ARGC = %s;" % (name, argc)]
+        test = testcase.TestCase(self, name, flags)
+        tests.append(test)
+      except:
+        # Work-around: If parsing didn't work, it might have been due to output
+        # caused by other d8 flags.
+        pass
     return tests
 
   def GetFlagsForTestCase(self, testcase, context):
     name = testcase.path
     basefile = os.path.join(self.root, "base.js")
     return testcase.flags + [basefile] + context.mode_flags
 
 def GetSuite(name, root):
   return FuzzNativesTestSuite(name, root)