Use per-frame WebTaskRunner with makeCancellable in AXObjectCacheImpl

third_party/WebKit/Source/modules/accessibility/AXObjectCacheImpl.h

 /*
  * Copyright (C) 2014, 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 18 matching lines @@
 #ifndef AXObjectCacheImpl_h
 #define AXObjectCacheImpl_h
 
 #include "core/dom/AXObjectCache.h"
 #include "modules/ModulesExport.h"
 #include "modules/accessibility/AXObject.h"
 #include "platform/Timer.h"
 #include "wtf/Forward.h"
 #include "wtf/HashMap.h"
 #include "wtf/HashSet.h"
+#include "wtf/MakeCancellable.h"
 #include <memory>
 
 namespace blink {
 
 class AbstractInlineTextBox;
 class HTMLAreaElement;
 class FrameView;
 
 // This class should only be used from inside the accessibility directory.
 class MODULES_EXPORT AXObjectCacheImpl : public AXObjectCache {
@@ skipping 174 matching lines @@
     // of its children. This is *unvalidated*, it includes ids that may not currently
     // exist in the tree.
     HashMap<AXID, HashSet<String>> m_ariaOwnerToIdsMapping;
 
     // Map from an ID (the ID attribute of a DOM element) to the set of elements that
     // want to own that ID. This is *unvalidated*, it includes possible duplicates.
     // This is used so that when an element with an ID is added to the tree or changes
     // its ID, we can quickly determine if it affects an aria-owns relationship.
     HashMap<String, std::unique_ptr<HashSet<AXID>>> m_idToAriaOwnersMapping;
 
-    Timer<AXObjectCacheImpl> m_notificationPostTimer;
+    WTF::ScopedFunctionCanceller m_notificationPostCanceller;
     HeapVector<std::pair<Member<AXObject>, AXNotification>> m_notificationsToPost;
-    void notificationPostTimerFired(TimerBase*);
+    void postNotificationsNow();
 
     AXObject* focusedImageMapUIElement(HTMLAreaElement*);
 
     AXID getAXID(AXObject*);
 
     void textChanged(Node*);
     bool nodeIsTextControl(const Node*);
 
     Settings* settings();
 };
 
 // This is the only subclass of AXObjectCache.
 DEFINE_TYPE_CASTS(AXObjectCacheImpl, AXObjectCache, cache, true, true);
 
 bool nodeHasRole(Node*, const String& role);
 // This will let you know if aria-hidden was explicitly set to false.
 bool isNodeAriaVisible(Node*);
 
 } // namespace blink
 
 #endif