[api,profiler] Introduce GetRetainerInfos callback for profiling

src/profiler/heap-profiler.h

 // Copyright 2009-2010 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PROFILER_HEAP_PROFILER_H_
 #define V8_PROFILER_HEAP_PROFILER_H_
 
 #include <memory>
 
 #include "src/isolate.h"
@@ skipping 48 matching lines @@
 
   void UpdateObjectSizeEvent(Address addr, int size);
 
   void DefineWrapperClass(
       uint16_t class_id, v8::HeapProfiler::WrapperInfoCallback callback);
 
   v8::RetainedObjectInfo* ExecuteWrapperClassCallback(uint16_t class_id,
                                                       Object** wrapper);
   void SetRetainedObjectInfo(UniqueId id, RetainedObjectInfo* info);
 
+  void SetGetRetainerInfosCallback(
+      v8::HeapProfiler::GetRetainerInfosCallback callback);
+
+  v8::HeapProfiler::RetainerInfos GetRetainerInfos(Isolate* isolate);
+
   bool is_tracking_object_moves() const { return is_tracking_object_moves_; }
   bool is_tracking_allocations() const { return !!allocation_tracker_; }
 
   Handle<HeapObject> FindHeapObjectById(SnapshotObjectId id);
   void ClearHeapObjectMap();
 
   Isolate* isolate() const { return heap()->isolate(); }
 
  private:
   Heap* heap() const;
 
   // Mapping from HeapObject addresses to objects' uids.
   std::unique_ptr<HeapObjectsMap> ids_;
   List<HeapSnapshot*> snapshots_;
   std::unique_ptr<StringsStorage> names_;
   List<v8::HeapProfiler::WrapperInfoCallback> wrapper_callbacks_;
   std::unique_ptr<AllocationTracker> allocation_tracker_;
   bool is_tracking_object_moves_;
   base::Mutex profiler_mutex_;
   std::unique_ptr<SamplingHeapProfiler> sampling_heap_profiler_;
+  v8::HeapProfiler::GetRetainerInfosCallback get_retainer_infos_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(HeapProfiler);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PROFILER_HEAP_PROFILER_H_