Convert first letter into a pseudo element.

Source/core/dom/RenderTreeBuilder.cpp

Index: Source/core/dom/RenderTreeBuilder.cpp
diff --git a/Source/core/dom/RenderTreeBuilder.cpp b/Source/core/dom/RenderTreeBuilder.cpp
index 7572603e73763b11ab81fd4bb3a7ae75ca1aa8b9..3c62d9c8f2ee4badc0bac4eb3384c37f6eb22d41 100644
--- a/Source/core/dom/RenderTreeBuilder.cpp
+++ b/Source/core/dom/RenderTreeBuilder.cpp
@@ -29,8 +29,10 @@
 #include "core/HTMLNames.h"
 #include "core/SVGNames.h"
 #include "core/css/resolver/StyleResolver.h"
+#include "core/dom/FirstLetterPseudoElement.h"
 #include "core/dom/Fullscreen.h"
 #include "core/dom/Node.h"
+#include "core/dom/PseudoElement.h"
 #include "core/dom/Text.h"
 #include "core/rendering/RenderFullScreen.h"
 #include "core/rendering/RenderObject.h"
@@ -54,6 +56,9 @@ RenderObject* RenderTreeBuilder::nextRenderer() const
     if (m_renderingParent->needsAttach())
         return 0;
 
+    if (element && element->isFirstLetterPseudoElement())
+        return FirstLetterPseudoElement::firstLetterTextRenderer(*element);
+
     return NodeRenderingTraversal::nextSiblingRenderer(m_node);
 }
 
@@ -63,6 +68,11 @@ RenderObject* RenderTreeBuilder::parentRenderer() const
 
     Element* element = m_node->isElementNode() ? toElement(m_node) : 0;
 
+    if (element && element->isFirstLetterPseudoElement()) {
+        RenderObject* nextRenderer = FirstLetterPseudoElement::firstLetterTextRenderer(*element);
+        return nextRenderer ? nextRenderer->parent() : nullptr;
+    }
+
     if (element && m_renderingParent->renderer()) {
         // FIXME: Guarding this by m_renderingParent->renderer() isn't quite right as the spec for
         // top layer only talks about display: none ancestors so putting a <dialog> inside an