Rewrite DocumentMarkerController to use SynchronousMutationObserver

third_party/WebKit/Source/core/dom/SynchronousMutationNotifier.h

 // Copyright 2016 The Chromium 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 SynchronousMutationNotifier_h
 #define SynchronousMutationNotifier_h
 
 #include "base/macros.h"
 #include "core/CoreExport.h"
 #include "platform/LifecycleNotifier.h"
 
 namespace blink {
 
 class CharacterData;
 class ContainerNode;
 class Document;
 class Node;
 class NodeWithIndex;
 class SynchronousMutationObserver;
 class Text;
 
 class CORE_EXPORT SynchronousMutationNotifier
     : public LifecycleNotifier<Document, SynchronousMutationObserver> {
  public:
+  class ScopedNotificationSuppressor {
+   public:
+    ScopedNotificationSuppressor(SynchronousMutationNotifier*);
+    ~ScopedNotificationSuppressor();
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(ScopedNotificationSuppressor);
+
+    Persistent<SynchronousMutationNotifier> m_notifier;
+  };
+
+  DECLARE_VIRTUAL_TRACE();
+
   // TODO(yosin): We will have |notifyXXX()| functions defined in
   // |SynchronousMutationObserver|.
   void notifyChangeChildren(const ContainerNode&);
   void notifyMergeTextNodes(const Text& mergedNode,
                             const NodeWithIndex& nodeToBeRemovedWithIndex,
                             unsigned oldLength);
   void notifyMoveTreeToNewDocument(const Node&);
   void notifySplitTextNode(const Text&);
   void notifyUpdateCharacterData(CharacterData*,
                                  unsigned offset,
                                  unsigned oldLength,
                                  unsigned newLength);
   void notifyNodeChildrenWillBeRemoved(ContainerNode&);
   void notifyNodeWillBeRemoved(Node&);
 
+  void incrementSuppressorCount();
+  void decrementSuppressorCount();
+
  protected:
   SynchronousMutationNotifier();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SynchronousMutationNotifier);
+
+  void notifyUpdateCharacterDataImmediately(CharacterData*,
+                                            unsigned offset,
+                                            unsigned oldLength,
+                                            unsigned newLength);
+  void flushPendingCharacterDataUpdate();
+
+  int m_suppressorCount;
+
+  // Data for pending character data update
+  Member<CharacterData> m_pendingCharacterData;
+  unsigned m_pendingOffset;
+  unsigned m_pendingOldLength;
+  unsigned m_pendingNewLength;
 };
 
 }  // namespace dom
 
 #endif  // SynchronousMutationNotifier_h