V8 Sampling Profiler: Collect V8 JitCodeEvents in tracing

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 975403641e0208cd0695f323eb63d9d6c4de8c7e..ab628322e18ecab3e7d329cd83f82e7003c6a9a9 100644
--- a/base/debug/trace_event.h
+++ b/base/debug/trace_event.h
@@ -350,6 +350,20 @@
 #define TRACE_EVENT_SET_SAMPLING_STATE(category, name) \
     TRACE_EVENT_SET_SAMPLING_STATE_FOR_BUCKET(0, category, name)
 
+#define TRACE_EVENT_SAMPLE_METADATA0(category, name)                   \
+  INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_METADATA, category, name, \
+                           TRACE_EVENT_FLAG_NONE | TRACE_EVENT_SCOPE_THREAD)

[yurys, 2015/01/14 13:41:36]

TRACE_EVENT_SCOPE_THREAD here and below?

[alph, 2015/01/14 14:31:10]

The flag and scope are different domains, so I specified both.
Actually I copypasted that from INSTANT_EVENT.
Anyway these are gone.

+
+#define TRACE_EVENT_SAMPLE_METADATA1(category, name, arg1_name, arg1_val)    \
+  INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_METADATA, category, name,       \
+                           TRACE_EVENT_FLAG_NONE | TRACE_EVENT_SCOPE_THREAD, \
+                           arg1_name, arg1_val)
+
+#define TRACE_EVENT_SAMPLE_METADATA2(category, name, arg1_name, arg1_val,    \
+                                     arg2_name, arg2_val)                    \
+  INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_METADATA, category, name,       \
+                           TRACE_EVENT_FLAG_NONE | TRACE_EVENT_SCOPE_THREAD, \
+                           arg1_name, arg1_val, arg2_name, arg2_val)
 
 // Records a single BEGIN event called "name" immediately, with 0, 1 or 2
 // associated arguments. If the category is not enabled, then this