Introduce Element::AttributeModificationParams

third_party/WebKit/Source/core/html/HTMLTrackElement.cpp

 /*
  * Copyright (C) 2011 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 59 matching lines @@
     parent->didAddTrackElement(this);
   return InsertionDone;
 }
 
 void HTMLTrackElement::removedFrom(ContainerNode* insertionPoint) {
   if (!parentNode() && isHTMLMediaElement(*insertionPoint))
     toHTMLMediaElement(insertionPoint)->didRemoveTrackElement(this);
   HTMLElement::removedFrom(insertionPoint);
 }
 
-void HTMLTrackElement::parseAttribute(const QualifiedName& name,
-                                      const AtomicString& oldValue,
-                                      const AtomicString& value) {
+void HTMLTrackElement::parseAttribute(
+    const AttributeModificationParams& params) {
+  const QualifiedName& name = params.name;
   if (name == srcAttr) {
-    if (!value.isEmpty())
+    if (!params.newValue.isEmpty())
       scheduleLoad();
     else if (m_track)
       m_track->removeAllCues();
 
     // 4.8.10.12.3 Sourcing out-of-band text tracks
     // As the kind, label, and srclang attributes are set, changed, or removed,
     // the text track must update accordingly...
   } else if (name == kindAttr) {
-    AtomicString lowerCaseValue = value.lower();
+    AtomicString lowerCaseValue = params.newValue.lower();
     // 'missing value default' ("subtitles")
     if (lowerCaseValue.isNull())
       lowerCaseValue = TextTrack::subtitlesKeyword();
     // 'invalid value default' ("metadata")
     else if (!TextTrack::isValidKindKeyword(lowerCaseValue))
       lowerCaseValue = TextTrack::metadataKeyword();
 
     track()->setKind(lowerCaseValue);
   } else if (name == labelAttr) {
-    track()->setLabel(value);
+    track()->setLabel(params.newValue);
   } else if (name == srclangAttr) {
-    track()->setLanguage(value);
+    track()->setLanguage(params.newValue);
   } else if (name == idAttr) {
-    track()->setId(value);
+    track()->setId(params.newValue);
   }
 
-  HTMLElement::parseAttribute(name, oldValue, value);
+  HTMLElement::parseAttribute(params);
 }
 
 const AtomicString& HTMLTrackElement::kind() {
   return track()->kind();
 }
 
 void HTMLTrackElement::setKind(const AtomicString& kind) {
   setAttribute(kindAttr, kind);
 }
 
@@ skipping 224 matching lines @@
   return nullptr;
 }
 
 DEFINE_TRACE(HTMLTrackElement) {
   visitor->trace(m_track);
   visitor->trace(m_loader);
   HTMLElement::trace(visitor);
 }
 
 }  // namespace blink