[profiler] Query retainer infos from embedder instead of using object grouping

src/profiler/heap-snapshot-generator.h

 // Copyright 2013 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_SNAPSHOT_GENERATOR_H_
 #define V8_PROFILER_HEAP_SNAPSHOT_GENERATOR_H_
 
 #include <deque>
 #include <unordered_map>
 
@@ skipping 478 matching lines @@
 class NativeObjectsExplorer {
  public:
   NativeObjectsExplorer(HeapSnapshot* snapshot,
                         SnapshottingProgressReportingInterface* progress);
   virtual ~NativeObjectsExplorer();
   int EstimateObjectsCount();
   bool IterateAndExtractReferences(SnapshotFiller* filler);
 
  private:
   void FillRetainedObjects();
-  void FillImplicitReferences();
+  void FillEdges();
   List<HeapObject*>* GetListMaybeDisposeInfo(v8::RetainedObjectInfo* info);
   void SetNativeRootReference(v8::RetainedObjectInfo* info);
   void SetRootNativeRootsReference();
   void SetWrapperNativeReferences(HeapObject* wrapper,
                                       v8::RetainedObjectInfo* info);
   void VisitSubtreeWrapper(Object** p, uint16_t class_id);
 
   static uint32_t InfoHash(v8::RetainedObjectInfo* info) {
     return ComputeIntegerHash(static_cast<uint32_t>(info->GetHash()),
                               v8::internal::kZeroHashSeed);
@@ skipping 15 matching lines @@
   StringsStorage* names_;
   bool embedder_queried_;
   HeapObjectsSet in_groups_;
   // RetainedObjectInfo* -> List<HeapObject*>*
   base::CustomMatcherHashMap objects_by_info_;
   base::CustomMatcherHashMap native_groups_;
   HeapEntriesAllocator* synthetic_entries_allocator_;
   HeapEntriesAllocator* native_entries_allocator_;
   // Used during references extraction.
   SnapshotFiller* filler_;
+  v8::HeapProfiler::RetainerEdges edges_;
 
   static HeapThing const kNativesRootObject;
 
   friend class GlobalHandlesExtractor;
 
   DISALLOW_COPY_AND_ASSIGN(NativeObjectsExplorer);
 };
 
 
 class HeapSnapshotGenerator : public SnapshottingProgressReportingInterface {
@@ skipping 78 matching lines @@
   friend class HeapSnapshotJSONSerializerIterator;
 
   DISALLOW_COPY_AND_ASSIGN(HeapSnapshotJSONSerializer);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PROFILER_HEAP_SNAPSHOT_GENERATOR_H_