Adding raw tracing to trace framework.

base/debug/trace_event.h

Index: base/debug/trace_event.h
diff --git a/base/debug/trace_event.h b/base/debug/trace_event.h
index d17328214e494283d1c6bf38d9d3393ed432faa6..b0b0d3a1324843304405586137a651e603bd334a 100644
--- a/base/debug/trace_event.h
+++ b/base/debug/trace_event.h
@@ -36,6 +36,8 @@
 //                    const unsigned char* category_enabled,
 //                    const char* name,
 //                    unsigned long long id,
+//                    int thread_id,
+//                    int64 timestamp,

[jar (doing other things), 2013/02/14 02:17:54]

nit: This arg list as waaaay long, and it is saddening that there are a bunch of
ints in a row (easy to mix them up, and hard to read).  Have you considered
using a base::Time or a base::TimeTicks here?  Each would (under the covers) be
an int64 in a class, and would avoid any chance of confusing the argements.

[dsinclair, 2013/02/14 15:38:47]

Done.

 //                    int num_args,
 //                    const char** arg_names,
 //                    const unsigned char* arg_types,