Add tracing support to NaCl

base/debug/trace_event_impl.h

Index: base/debug/trace_event_impl.h
diff --git a/base/debug/trace_event_impl.h b/base/debug/trace_event_impl.h
index 33e782c04a57455562630ec196236617c846c4d8..8ef4531e1574bd2c44a73e601e5abfb945fcbd1a 100644
--- a/base/debug/trace_event_impl.h
+++ b/base/debug/trace_event_impl.h
@@ -310,6 +310,10 @@ class BASE_EXPORT TraceLog {
 
   void SetProcessID(int process_id);
 
+  // Allow setting an offset between the current TimeTicks time and the time
+  // that should be reported.
+  void SetTimeOffset(TimeDelta offset);
+
  private:
   // This allows constructor and destructor to be private and usable only
   // by the Singleton class.
@@ -385,6 +389,8 @@ class BASE_EXPORT TraceLog {
 
   int process_id_;
 
+  TimeDelta time_offset_;
+
   // Allow tests to wake up when certain events occur.
   const unsigned char* watch_category_;
   std::string watch_event_name_;