DevTools: [CSS] cache lineEndings in InspectorStyleSheet

Source/core/inspector/InspectorStyleSheet.h

 /*
  * Copyright (C) 2010, 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 36 matching lines @@
 class CSSStyleSheet;
 class Document;
 class Element;
 class ExceptionState;
 class InspectorPageAgent;
 class InspectorResourceAgent;
 class InspectorStyleSheetBase;
 
 typedef WillBeHeapVector<RefPtrWillBeMember<CSSRule> > CSSRuleVector;
 typedef String ErrorString;
+typedef Vector<unsigned> LineEndings;
 
 class InspectorCSSId {
 public:
     InspectorCSSId()
         : m_ordinal(0)
     {
     }
 
     InspectorCSSId(const String& styleSheetId, unsigned ordinal)
         : m_styleSheetId(styleSheetId)
@@ skipping 94 matching lines @@
     virtual InspectorCSSId styleId(CSSStyleDeclaration*) const = 0;
 
     PassRefPtr<TypeBuilder::CSS::CSSStyle> buildObjectForStyle(CSSStyleDeclaration*);
     bool findPropertyByRange(const SourceRange&, InspectorCSSId*, unsigned* propertyIndex, bool* overwrite);
     bool lineNumberAndColumnToOffset(unsigned lineNumber, unsigned columnNumber, unsigned* offset);
 
 protected:
     InspectorStyleSheetBase(const String& id, Listener*);
 
     Listener* listener() const { return m_listener; }
-    void fireStyleSheetChanged();
-    PassOwnPtr<Vector<unsigned> > lineEndings();
+    void onStyleSheetTextChanged();
+    const LineEndings* lineEndings();
 
     virtual PassRefPtrWillBeRawPtr<InspectorStyle> inspectorStyleForId(const InspectorCSSId&) = 0;
     virtual unsigned ruleCount() = 0;
 
     // Also accessed by friend class InspectorStyle.
     virtual PassRefPtrWillBeRawPtr<CSSRuleSourceData> ruleSourceDataAt(unsigned) const = 0;
     virtual bool ensureParsedDataReady() = 0;
 
 private:
     friend class InspectorStyle;
 
     String m_id;
     Listener* m_listener;
+    OwnPtr<LineEndings> m_lineEndings;
 };
 
 class InspectorStyleSheet : public InspectorStyleSheetBase {
 public:
     static PassRefPtrWillBeRawPtr<InspectorStyleSheet> create(InspectorPageAgent*, InspectorResourceAgent*, const String& id, PassRefPtrWillBeRawPtr<CSSStyleSheet> pageStyleSheet, TypeBuilder::CSS::StyleSheetOrigin::Enum, const String& documentURL, Listener*);
 
     virtual ~InspectorStyleSheet();
     virtual void trace(Visitor*) override;
 
     String finalURL() const;
@@ skipping 104 matching lines @@
     mutable String m_styleText;
     mutable bool m_isStyleTextValid;
 };
 
 
 } // namespace blink
 
 WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(blink::InspectorStyleProperty);
 
 #endif // !defined(InspectorStyleSheet_h)