Convert first letter into a pseudo element.

Source/core/dom/FirstLetterPseudoElement.h

+// Copyright (c) 2014 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 FirstLetterPseudoElement_h
+#define FirstLetterPseudoElement_h
+
+#include "core/dom/Document.h"
+#include "core/dom/PseudoElement.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+class Element;
+class RenderObject;
+
+class FirstLetterPseudoElement FINAL : public PseudoElement {
+WTF_MAKE_NONCOPYABLE(FirstLetterPseudoElement);
+public:
+    static RenderObject* firstLetterTextRenderer(const Element&);
+    static unsigned firstLetterLength(const String&);
+
+    void setRemainingTextRenderer(RenderTextFragment* fragment) { m_remainingTextRenderer = fragment; }
+    RenderTextFragment* remainingTextRenderer() const { return m_remainingTextRenderer; }
+
+    void setNeedsUpdate()
+    {
+        m_needsUpdate = true;
+        setNeedsStyleRecalc(LocalStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::PseudoClass));
+    }
+
+    bool needsUpdate() const {return m_needsUpdate; }
+
+    virtual void attach(const AttachContext& = AttachContext()) OVERRIDE;
+    virtual void detach(const AttachContext& = AttachContext()) OVERRIDE;
+
+private:
+    friend class PseudoElement; // For constructor.
+
+    FirstLetterPseudoElement(Element*);
+
+    virtual void didRecalcStyle(StyleRecalcChange) OVERRIDE;
+
+    void attachFirstLetterTextRenderers();
+    RenderStyle* styleForFirstLetter(RenderObject*);
+
+    RenderTextFragment* m_remainingTextRenderer;
+    bool m_needsUpdate;
+};
+
+DEFINE_ELEMENT_TYPE_CASTS(FirstLetterPseudoElement, isFirstLetterPseudoElement());
+
+} // namespace blink
+
+#endif // FirstLetterPseudoElement_h