[wrapper-tracing] Add heap snapshot generator infrastructure

third_party/WebKit/Source/bindings/core/v8/V8GCController.h

Index: third_party/WebKit/Source/bindings/core/v8/V8GCController.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8GCController.h b/third_party/WebKit/Source/bindings/core/v8/V8GCController.h
index 29b68e5265584e1eb9e968f3bcd0cc33f6f23e53..ca47e1ec1c2414c0dbfa2d49395aeae05b9927aa 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8GCController.h
+++ b/third_party/WebKit/Source/bindings/core/v8/V8GCController.h
@@ -34,6 +34,7 @@
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Allocator.h"
+#include <v8-profiler.h>
 #include <v8.h>
 
 namespace blink {
@@ -59,6 +60,8 @@ class CORE_EXPORT V8GCController {
 
   static void traceDOMWrappers(v8::Isolate*, Visitor*);
   static bool hasPendingActivity(v8::Isolate*, ExecutionContext*);
+
+  static v8::HeapProfiler::RetainerInfos getRetainerInfos(v8::Isolate*);
 };
 
 }  // namespace blink