Non-SFI NaCl: Allow CLOCK_SYSTEM_TRACE on Chrome OS

base/time/time.h

Index: base/time/time.h
diff --git a/base/time/time.h b/base/time/time.h
index f08ba68495cd773a77d92fb19ad15807950e4f99..41d662afa6a908a513d90acaed56d58eaa58d54e 100644
--- a/base/time/time.h
+++ b/base/time/time.h
@@ -576,6 +576,14 @@ inline Time TimeDelta::operator+(Time t) const {
 
 class BASE_EXPORT TimeTicks {
  public:
+  // We define this even without OS_CHROMEOS for seccomp sandbox testing.
+#if defined(OS_LINUX)
+  // Force definition of the system trace clock; it is a chromeos-only api
+  // at the moment and surfacing it in the right place requires mucking
+  // with glibc et al.
+  static const clockid_t kClockSystemTrace = 11;
+#endif
+
   TimeTicks() : ticks_(0) {
   }