Simple BlinkGC heap compaction.

third_party/WebKit/Source/platform/heap/HeapTest.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 314 matching lines @@
   void mark(const void* object, TraceCallback) override {
     if (object)
       m_count++;
   }
 
   void markHeader(HeapObjectHeader* header, TraceCallback callback) override {
     ASSERT(header->payload());
     m_count++;
   }
 
-  void registerDelayedMarkNoTracing(const void*) override {}
+  void registerDelayedMarkNoTracing(void**) override {}
   void registerWeakMembers(const void*, const void*, WeakCallback) override {}
   void registerWeakTable(const void*,
                          EphemeronCallback,
                          EphemeronCallback) override {}
 #if ENABLE(ASSERT)
   bool weakTableRegistered(const void*) override { return false; }
 #endif
   void registerWeakCellWithCallback(void**, WeakCallback) override {}
   bool ensureMarked(const void* objectPointer) override {
     if (!objectPointer ||
         HeapObjectHeader::fromPayload(objectPointer)->isMarked())
       return false;
     markNoTracing(objectPointer);
     return true;
   }
 
+  void registerMovingObjectReference(MovableReference*) override {}
+
+  void registerMovingObjectCallback(MovableReference,
+                                    MovingObjectCallback,
+                                    void*) override {}
+
   size_t count() { return m_count; }
   void reset() { m_count = 0; }
 
  private:
   StackFrameDepthScope m_scope;
   size_t m_count;
 };
 
 #undef DEFINE_VISITOR_METHODS
 
@@ skipping 6445 matching lines @@
       "HeapVector");
   static_assert(
       WTF::IsGarbageCollectedType<HeapDeque<Member<IntWrapper>>>::value,
       "HeapDeque");
   static_assert(WTF::IsGarbageCollectedType<
                     HeapTerminatedArray<Member<IntWrapper>>>::value,
                 "HeapTerminatedArray");
 }
 
 }  // namespace blink