Update from https://crrev.com/303153

tools/valgrind/chrome_tests.py

Index: tools/valgrind/chrome_tests.py
diff --git a/tools/valgrind/chrome_tests.py b/tools/valgrind/chrome_tests.py
index e4f62a5d865a09d99a801441d82926e8f62b74a0..8735e0d1f95f27ac0fb7ae28b5dc8a411c90d0f0 100755
--- a/tools/valgrind/chrome_tests.py
+++ b/tools/valgrind/chrome_tests.py
@@ -148,6 +148,8 @@ class ChromeTests:
       cmd.append("--gtest_repeat=%s" % self._options.gtest_repeat)
     if self._options.gtest_shuffle:
       cmd.append("--gtest_shuffle")
+    if self._options.gtest_break_on_failure:
+      cmd.append("--gtest_break_on_failure")
     if self._options.brave_new_test_launcher:
       cmd.append("--brave-new-test-launcher")
     if self._options.test_launcher_bot_mode:
@@ -737,6 +739,12 @@ def _main():
   parser.add_option("--gtest_repeat", help="argument for --gtest_repeat")
   parser.add_option("--gtest_shuffle", action="store_true", default=False,
                     help="Randomize tests' orders on every iteration.")
+  parser.add_option("--gtest_break_on_failure", action="store_true",
+                    default=False,
+                    help="Drop in to debugger on assertion failure. Also "
+                         "useful for forcing tests to exit with a stack dump "
+                         "on the first assertion failure when running with "
+                         "--gtest_repeat=-1")
   parser.add_option("-v", "--verbose", action="store_true", default=False,
                     help="verbose output - enable debug log messages")
   parser.add_option("--tool", dest="valgrind_tool", default="memcheck",