Use absolute pcs and load locations to symbolize on macOS.

tracing/bin/symbolize_trace_macho_reader_unittest.py

+#!/usr/bin/env python
+# Copyright 2017 The Chromium 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
+import sys
+import unittest
+
+sys.path.insert(0, os.path.dirname(__file__))
+import symbolize_trace_macho_reader
+
+
+class AtosRegexTest(unittest.TestCase):
+  def testRegex(self):
+    if sys.platform != "darwin":
+      return
+    file_name = "/System/Library/Frameworks/IOKit.framework/Versions/A/IOKit"
+    result = symbolize_trace_macho_reader.ReadMachOTextLoadAddress(file_name)
+    self.assertNotEqual(None, result)
+
+    file_name = "/System/Library/Frameworks/Cocoa.framework/Versions/A/Cocoa"
+    result = symbolize_trace_macho_reader.ReadMachOTextLoadAddress(file_name)
+    self.assertNotEqual(None, result)
+
+
+if __name__ == '__main__':
+  unittest.main()