Do not fire timers for finalizing objects.

Source/platform/heap/ThreadState.h

 /*
  * 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 242 matching lines @@
     using AttachedThreadStateSet = HashSet<ThreadState*>;
     static AttachedThreadStateSet& attachedThreads();
 
     // Initialize threading infrastructure. Should be called from the main
     // thread.
     static void init();
     static void shutdown();
     static void shutdownHeapIfNecessary();
     bool isTerminating() { return m_isTerminating; }
 
+    bool lazySweepToken() { return m_lazySweepToggle; }
+
     static void attachMainThread();
     static void detachMainThread();
 
     // Trace all persistent roots, called when marking the managed heap objects.
     static void visitPersistentRoots(Visitor*);
 
     // Trace all objects found on the stack, used when doing conservative GCs.
     static void visitStackRoots(Visitor*);
 
     // Associate ThreadState object with the current thread. After this
@@ skipping 360 matching lines @@
     Vector<Interruptor*> m_interruptors;
     bool m_didV8GCAfterLastGC;
     bool m_sweepForbidden;
     size_t m_noAllocationCount;
     size_t m_allocatedObjectSizeBeforeGC;
     ThreadHeap* m_heaps[NumberOfHeaps];
 
     Vector<OwnPtr<CleanupTask>> m_cleanupTasks;
     bool m_isTerminating;
 
+    // Lazy sweeping will mark pages as having been swept as the
+    // operation progresses. This is done by encoding the current
+    // lazy sweep state of their ThreadState on the page. Just a
+    // single bit is required, which is toggled when a new sweep
+    // is initiated.
+    bool m_lazySweepToggle;
+
     bool m_shouldFlushHeapDoesNotContainCache;
     double m_collectionRate;
     GCState m_gcState;
 
     CallbackStack* m_weakCallbackStack;
     HashMap<void*, bool (*)(void*, Visitor&)> m_preFinalizers;
 
     v8::Isolate* m_isolate;
     void (*m_traceDOMWrappers)(v8::Isolate*, Visitor*);
 
@@ skipping 72 matching lines @@
         m_locked = false;
     }
 
     MutexBase& m_mutex;
     bool m_locked;
 };
 
 } // namespace blink
 
 #endif // ThreadState_h