Add tracing support to NaCl

base/debug/trace_event_impl.cc

Index: base/debug/trace_event_impl.cc
diff --git a/base/debug/trace_event_impl.cc b/base/debug/trace_event_impl.cc
index 823acbe17726396b25168599476f1c85f5760e88..66872184a1817d62d27fdebf51071f26be4e79fc 100644
--- a/base/debug/trace_event_impl.cc
+++ b/base/debug/trace_event_impl.cc
@@ -627,7 +627,7 @@ int TraceLog::AddTraceEvent(char phase,
                num_args, arg_names, arg_types, arg_values);
 #endif
 
-  TimeTicks now = TimeTicks::NowFromSystemTraceTime();
+  TimeTicks now = TimeTicks::NowFromSystemTraceTime() - time_offset_;
   NotificationHelper notifier(this);
   int ret_begin_id = -1;
   {
@@ -804,5 +804,9 @@ void TraceLog::SetProcessID(int process_id) {
   process_id_hash_ = (offset_basis ^ pid) * fnv_prime;
 }
 
+void TraceLog::SetTimeOffset(TimeDelta offset) {
+  time_offset_ = offset;
+}
+
 }  // namespace debug
 }  // namespace base