Increase fudge factor to let WatchdogTest.AlarmTest pass reliably on slower m...

base/watchdog.cc

Index: base/watchdog.cc
===================================================================
--- base/watchdog.cc	(revision 11556)
+++ base/watchdog.cc	(working copy)
@@ -109,7 +109,10 @@
       TimeTicks last_alarm_time = TimeTicks::Now();
       watchdog_->Alarm();  // Set a break point here to debug on alarms.
       TimeDelta last_alarm_delay = TimeTicks::Now() - last_alarm_time;
-      if (last_alarm_delay > TimeDelta::FromMilliseconds(2)) {
+      // Normally, a threshold of 2ms works here, but 10x higher
+      // threshold needed to reliably pass WatchdogTest.AlarmTest
+      // under valgrind on an old 3.4GHz Pentium 4.  Use 15x for margin.
+      if (last_alarm_delay > TimeDelta::FromMilliseconds(30)) {
         // Ignore race of two alarms/breaks going off at roughly the same time.
         AutoLock static_lock(static_lock_);
         // This was a real debugger break.