[counters] adding runtime call timers for GC

src/heap/gc-tracer.h

Index: src/heap/gc-tracer.h
diff --git a/src/heap/gc-tracer.h b/src/heap/gc-tracer.h
index 90ea41027c43f19af461d91bc65d7efc56aedf18..8a6dceb72227c01125e5bacb236e37e975b4fc54 100644
--- a/src/heap/gc-tracer.h
+++ b/src/heap/gc-tracer.h
@@ -6,6 +6,7 @@
 #define V8_HEAP_GC_TRACER_H_
 
 #include "src/base/platform/platform.h"
+#include "src/counters.h"
 #include "src/globals.h"
 
 namespace v8 {
@@ -88,7 +89,6 @@ class RingBuffer {
 
 enum ScavengeSpeedMode { kForAllObjects, kForSurvivedObjects };
 
-
 // GCTracer collects and prints ONE line after each garbage collector
 // invocation IFF --trace_gc is used.
 // TODO(ernstm): Unit tests.
@@ -152,6 +152,7 @@ class GCTracer {
     GCTracer* tracer_;
     ScopeId scope_;
     double start_time_;
+    RuntimeCallTimer timer_;

[Camillo Bruni, 2016/03/23 13:54:02]

RuntimeCallTimer is a 3 word object.

 
     DISALLOW_COPY_AND_ASSIGN(Scope);
   };