[Telemetry] Fix page_cycler benchmark on machines in positive timezones.

tools/telemetry/telemetry/core/chrome/win_platform_backend.py

Index: tools/telemetry/telemetry/core/chrome/win_platform_backend.py
diff --git a/tools/telemetry/telemetry/core/chrome/win_platform_backend.py b/tools/telemetry/telemetry/core/chrome/win_platform_backend.py
index edc873cd838dc59b68da603214a4e34c05aaf102..f3d50aedbb64b5cebe44b73e4e8d4a1d88ae5635 100644
--- a/tools/telemetry/telemetry/core/chrome/win_platform_backend.py
+++ b/tools/telemetry/telemetry/core/chrome/win_platform_backend.py
@@ -4,6 +4,7 @@
 
 import collections
 import ctypes
+import re
 import subprocess
 try:
   import pywintypes  # pylint: disable=F0401
@@ -113,7 +114,7 @@ class WinPlatformBackend(platform_backend.PlatformBackend):
       _, creation, curr_ppid, curr_pid = creation_ppid_pid.split(',')
       ppid_map[int(curr_ppid)].append(int(curr_pid))
       if creation:
-        creation_map[int(curr_pid)] = float(creation.split('-')[0])
+        creation_map[int(curr_pid)] = float(re.split('[+-]', creation)[0])
 
     def _InnerGetChildPids(pid):
       if not pid or pid not in ppid_map: