Implement a new flow event API that allows binding flow events and regular events.

base/trace_event/trace_event_impl.h

Index: base/trace_event/trace_event_impl.h
diff --git a/base/trace_event/trace_event_impl.h b/base/trace_event/trace_event_impl.h
index 93212558aa7a451eca89e9fb112f450a765db250..4d3de6bc847c66780dd7946828953eb4e764b9e2 100644
--- a/base/trace_event/trace_event_impl.h
+++ b/base/trace_event/trace_event_impl.h
@@ -117,6 +117,7 @@ class BASE_EXPORT TraceEvent {
       const char* name,
       unsigned long long id,
       unsigned long long context_id,
+      unsigned long long bind_id,
       int num_args,
       const char** arg_names,
       const unsigned char* arg_types,
@@ -188,6 +189,7 @@ class BASE_EXPORT TraceEvent {
   int thread_id_;
   char phase_;
   unsigned int flags_;
+  unsigned long long bind_id_;
   unsigned char arg_types_[kTraceMaxNumArgs];
 
   DISALLOW_COPY_AND_ASSIGN(TraceEvent);
@@ -475,7 +477,21 @@ class BASE_EXPORT TraceLog : public MemoryDumpProvider {
       const unsigned char* category_group_enabled,
       const char* name,
       unsigned long long id,
+      int thread_id,
+      const TraceTicks& timestamp,
+      int num_args,
+      const char** arg_names,
+      const unsigned char* arg_types,
+      const unsigned long long* arg_values,
+      const scoped_refptr<ConvertableToTraceFormat>* convertable_values,
+      unsigned int flags);
+  TraceEventHandle AddTraceEventWithThreadIdAndTimestamp(
+      char phase,
+      const unsigned char* category_group_enabled,
+      const char* name,
+      unsigned long long id,
       unsigned long long context_id,
+      unsigned long long bind_id,
       int thread_id,
       const TraceTicks& timestamp,
       int num_args,