Issue #2101 - Part 3: Update libyuv

Updated to version 1861, git revision 88b050f337cc0ca2a51800fe7bf4737222c87344 from
https://chromium.googlesource.com/libyuv/libyuv/

media/libyuv/tools_libyuv/get_landmines.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+
+# Copyright 2016 The LibYuv 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 in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS. All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+"""
+This file emits the list of reasons why a particular build needs to be clobbered
+(or a list of 'landmines').
+"""
+
+import sys
+
+
+def print_landmines():
+  """
+  ALL LANDMINES ARE EMITTED FROM HERE.
+  """
+  # DO NOT add landmines as part of a regular CL. Landmines are a last-effort
+  # bandaid fix if a CL that got landed has a build dependency bug and all bots
+  # need to be cleaned up. If you're writing a new CL that causes build
+  # dependency problems, fix the dependency problems instead of adding a
+  # landmine.
+  # See the Chromium version in src/build/get_landmines.py for usage examples.
+  print('Clobber to remove GYP artifacts after switching bots to GN.')
+  print('Another try to remove GYP artifacts after switching bots to GN.')
+
+
+def main():
+  print_landmines()
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())