Update libyuv to r1602 version to get best performance.

Bug: 29870647

Change-Id: I8ec9fab7f55765fa33ebe7ba1c7ad2147f418de2
diff --git a/files/PRESUBMIT.py b/files/PRESUBMIT.py
new file mode 100755
index 0000000..58242bd
--- /dev/null
+++ b/files/PRESUBMIT.py
@@ -0,0 +1,65 @@
+# Copyright 2014 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.
+
+import re
+import sys
+
+
+def GetDefaultTryConfigs(bots=None):
+  """Returns a list of ('bot', set(['tests']), optionally filtered by [bots].
+
+  For WebRTC purposes, we always return an empty list of tests, since we want
+  to run all tests by default on all our trybots.
+  """
+  return { 'tryserver.libyuv': dict((bot, []) for bot in bots)}
+
+
+# pylint: disable=W0613
+def GetPreferredTryMasters(project, change):
+  files = change.LocalPaths()
+  bots = [
+    'win',
+    'win_rel',
+    'win_x64_rel',
+    'win_x64_gn',
+    'win_x64_gn_rel',
+    'win_clang',
+    'win_clang_rel',
+    'win_x64_clang_rel',
+    'mac',
+    'mac_rel',
+    'mac_gn',
+    'mac_gn_rel',
+    'mac_asan',
+    'ios',
+    'ios_rel',
+    'ios_arm64',
+    'ios_arm64_rel',
+    'linux',
+    'linux_rel',
+    'linux_gn',
+    'linux_gn_rel',
+    'linux_memcheck',
+    'linux_tsan2',
+    'linux_asan',
+    'linux_msan',
+    'linux_ubsan',
+    'linux_ubsan_vptr',
+    'android',
+    'android_rel',
+    'android_clang',
+    'android_arm64',
+    'android_mips',
+    'android_x64',
+    'android_x86',
+    'android_gn',
+    'android_gn_rel',
+  ]
+  if not files or all(re.search(r'[\\/]OWNERS$', f) for f in files):
+    return {}
+  return GetDefaultTryConfigs(bots)