Make timeout_retry include the total timeout in the exception error

devil/devil/utils/watchdog_timer.py

Index: devil/devil/utils/watchdog_timer.py
diff --git a/devil/devil/utils/watchdog_timer.py b/devil/devil/utils/watchdog_timer.py
index 2f4c46455be7c9751e9a570a8f41cac0e3430cf7..bff1f8cc0143efcdc98dec774a5be56e3fb242f0 100644
--- a/devil/devil/utils/watchdog_timer.py
+++ b/devil/devil/utils/watchdog_timer.py
@@ -37,6 +37,10 @@ class WatchdogTimer(object):
     else:
       return None
 
+  def GetTimeout(self):
+    """Returns the timout of the watchdog."""
+    return self._timeout
+
   def IsTimedOut(self):
     """Whether the watchdog has timed out.