Introduce api for incremental wrapper tracing

src/heap/mark-compact.h

 // Copyright 2012 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_HEAP_MARK_COMPACT_H_
 #define V8_HEAP_MARK_COMPACT_H_
 
 #include <deque>
 
 #include "src/base/bits.h"
@@ skipping 595 matching lines @@
   // when mark bits are still intact.
   bool IsSlotInBlackObject(MemoryChunk* p, Address slot);
   HeapObject* FindBlackObjectBySlotSlow(Address slot);
 
   // Removes all the slots in the slot buffers that are within the given
   // address range.
   void RemoveObjectSlots(Address start_slot, Address end_slot);
 
   Sweeper& sweeper() { return sweeper_; }
 
-  std::vector<std::pair<void*, void*>>& wrappers_to_trace() {
-    return wrappers_to_trace_;
-  }
+  void RegisterWrappersWithEmbedderHeapTracer();
 
   void SetEmbedderHeapTracer(EmbedderHeapTracer* tracer);
 
   EmbedderHeapTracer* embedder_heap_tracer() { return embedder_heap_tracer_; }
 
   bool UsingEmbedderHeapTracer() { return embedder_heap_tracer(); }
 
   void TracePossibleWrapper(JSObject* js_object);
 
   void RegisterExternallyReferencedObject(Object** object);
@@ skipping 263 matching lines @@
  private:
   MarkCompactCollector* collector_;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_MARK_COMPACT_H_