Convert first letter into a pseudo element.

Source/core/dom/ElementRareData.h

Index: Source/core/dom/ElementRareData.h
diff --git a/Source/core/dom/ElementRareData.h b/Source/core/dom/ElementRareData.h
index f1d57ba51a1c909c77d51c452cced0e530c1c792..7bba0b61b6ea7e6fbaf9426d22206243c1eae5e5 100644
--- a/Source/core/dom/ElementRareData.h
+++ b/Source/core/dom/ElementRareData.h
@@ -148,6 +148,7 @@ private:
 
     RefPtrWillBeMember<PseudoElement> m_generatedBefore;
     RefPtrWillBeMember<PseudoElement> m_generatedAfter;
+    RefPtrWillBeMember<PseudoElement> m_generatedFirstLetter;
     RefPtrWillBeMember<PseudoElement> m_backdrop;
 
     explicit ElementRareData(RenderObject*);
@@ -173,12 +174,13 @@ inline ElementRareData::~ElementRareData()
 #endif
     ASSERT(!m_generatedBefore);
     ASSERT(!m_generatedAfter);
+    ASSERT(!m_generatedFirstLetter);
     ASSERT(!m_backdrop);
 }
 
 inline bool ElementRareData::hasPseudoElements() const
 {
-    return m_generatedBefore || m_generatedAfter || m_backdrop;
+    return m_generatedBefore || m_generatedAfter || m_backdrop || m_generatedFirstLetter;
 }
 
 inline void ElementRareData::clearPseudoElements()
@@ -186,6 +188,7 @@ inline void ElementRareData::clearPseudoElements()
     setPseudoElement(BEFORE, nullptr);
     setPseudoElement(AFTER, nullptr);
     setPseudoElement(BACKDROP, nullptr);
+    setPseudoElement(FIRST_LETTER, nullptr);
 }
 
 inline void ElementRareData::setPseudoElement(PseudoId pseudoId, PassRefPtrWillBeRawPtr<PseudoElement> element)
@@ -206,6 +209,11 @@ inline void ElementRareData::setPseudoElement(PseudoId pseudoId, PassRefPtrWillB
             m_backdrop->dispose();
         m_backdrop = element;
         break;
+    case FIRST_LETTER:
+        if (m_generatedFirstLetter)
+            m_generatedFirstLetter->dispose();
+        m_generatedFirstLetter = element;
+        break;
     default:
         ASSERT_NOT_REACHED();
     }
@@ -220,6 +228,8 @@ inline PseudoElement* ElementRareData::pseudoElement(PseudoId pseudoId) const
         return m_generatedAfter.get();
     case BACKDROP:
         return m_backdrop.get();
+    case FIRST_LETTER:
+        return m_generatedFirstLetter.get();
     default:
         return 0;
     }