Enable crash symbols unit test for Mac OSX.

R=nednguyen@google.com
BUG=563716

Review URL: https://codereview.chromium.org/1586143003

Cr-Commit-Position: refs/heads/master@{#370745}

tools/perf/core/stacktrace_unittest.py

@@ -20,9 +20,9 @@ class TabStackTraceTest(tab_test_case.TabTestCase):
       self.assertIn('Thread 0 (crashed)', '\n'.join(e.stack_trace))
 
   # Currently stack traces do not work on windows: http://crbug.com/476110
-  # Currently symbols do not work on swarming: http://crbug.com/563716
   # Linux stack traces depends on fission support: http://crbug.com/405623
-  @decorators.Disabled('all')
+  @decorators.Enabled('mac')
+  @decorators.Disabled('snowleopard')
   def testCrashSymbols(self):
     try:
       self._tab.Navigate('chrome://crash', timeout=5)

tools/telemetry/telemetry/internal/backends/chrome/desktop_browser_backend.py

@@ -47,7 +47,12 @@ def GetSymbolBinary(executable, os_name):
                                     'Chromium Framework.framework',
                                     'Chromium Framework')
       if os.path.isfile(framework_file):
-        return framework_file
+        # Sometimes dyld returns symbols for a different file. Emulate what it
+        # does here by using the same mechanism to find the binary file.
+        import fcntl
+        F_GETPATH = 50
+        with open(framework_file, 'rb') as f:
+          return fcntl.fcntl(f.fileno(), F_GETPATH, b'\0' * 1024).rstrip(b'\0')
 
   return executable