Roll chromium_revision 375f736..91f1781

Relevant changes:
* buildtools: 51ca1f2..c27f95b
* tools/gyp: b13d8f2..487c0b6
* tools/swarming_client: 41036ec..1f8ba35
Details: 375f736..91f1781/DEPS

Clang version was not updated in this roll.

BUG=
R=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/30049004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7680 4adac7df-926f-26a2-2b94-8c16560cd09d

tools/valgrind-webrtc/webrtc_tests.py

@@ -100,6 +100,12 @@ def main(_):
                     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',