Make SynchronousMutationObserver::didMergeTextNodes() to take both merged and merging nodes

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 740 matching lines @@
   // nodeWillBeRemoved is only safe when removing one node at a time.
   void nodeWillBeRemoved(Node&);
   // Called just before a destructive update to some CharacterData.
   void dataWillChange(const CharacterData&);
   bool canAcceptChild(const Node& newChild,
                       const Node* oldChild,
                       ExceptionState&) const;
 
   void didInsertText(Node*, unsigned offset, unsigned length);
   void didRemoveText(Node*, unsigned offset, unsigned length);
-  void didMergeTextNodes(Text& oldNode, unsigned offset);
+  void didMergeTextNodes(const Text& mergedNode,
+                         const Text& nodeToBeRemoved,
+                         unsigned oldLength);
   void didSplitTextNode(const Text& oldNode);
 
   void clearDOMWindow() { m_domWindow = nullptr; }
   LocalDOMWindow* domWindow() const { return m_domWindow; }
 
   // Helper functions for forwarding LocalDOMWindow event related tasks to the
   // LocalDOMWindow if it exists.
   void setWindowAttributeEventListener(const AtomicString& eventType,
                                        EventListener*);
   EventListener* getWindowAttributeEventListener(const AtomicString& eventType);
@@ skipping 951 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 }  // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLiveDocumentInstances();
 #endif
 
 #endif  // Document_h