Introduce SynchronousMutationObserver::didChangeAttribute()

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

Index: third_party/WebKit/Source/core/dom/SynchronousMutationNotifier.h
diff --git a/third_party/WebKit/Source/core/dom/SynchronousMutationNotifier.h b/third_party/WebKit/Source/core/dom/SynchronousMutationNotifier.h
index 813f2097cbe8aba08c885c1cf40476beab0389b2..2c1f4b26580cf1203fb105d1ce2c11eda95866f8 100644
--- a/third_party/WebKit/Source/core/dom/SynchronousMutationNotifier.h
+++ b/third_party/WebKit/Source/core/dom/SynchronousMutationNotifier.h
@@ -14,6 +14,7 @@ namespace blink {
 class CharacterData;
 class ContainerNode;
 class Document;
+class Element;
 class Node;
 class NodeWithIndex;
 class SynchronousMutationObserver;
@@ -22,8 +23,7 @@ class Text;
 class CORE_EXPORT SynchronousMutationNotifier
     : public LifecycleNotifier<Document, SynchronousMutationObserver> {
  public:
-  // TODO(yosin): We will have |notifyXXX()| functions defined in
-  // |SynchronousMutationObserver|.
+  void notifyChangeAttribute(const Element&);
   void notifyChangeChildren(const ContainerNode&);
   void notifyMergeTextNodes(const Text& mergedNode,
                             const NodeWithIndex& nodeToBeRemovedWithIndex,