Pass start/length at InlineTextBox construction time.

Source/core/rendering/InlineTextBox.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 56 matching lines @@
 };
 
 COMPILE_ASSERT(sizeof(InlineTextBox) == sizeof(SameSizeAsInlineTextBox), InlineTextBox_should_stay_small);
 
 typedef WTF::HashMap<const InlineTextBox*, LayoutRect> InlineTextBoxOverflowMap;
 static InlineTextBoxOverflowMap* gTextBoxesWithOverflow;
 
 typedef WTF::HashMap<const InlineTextBox*, TextBlobPtr> InlineTextBoxBlobCacheMap;
 static InlineTextBoxBlobCacheMap* gTextBlobCache;
 
+static void removeFromTextBlobCache(InlineTextBox* textBox)
+{
+    if (gTextBlobCache)
+        gTextBlobCache->remove(textBox);
+}
+
 static const int misspellingLineThickness = 3;
 
 void InlineTextBox::destroy()
 {
     AbstractInlineTextBox::willDestroy(this);
 
     if (!knownToHaveNoOverflow() && gTextBoxesWithOverflow)
         gTextBoxesWithOverflow->remove(this);
-    if (gTextBlobCache)
-        gTextBlobCache->remove(this);
+    removeFromTextBlobCache(this);
     InlineBox::destroy();
 }
 
+void InlineTextBox::offsetRun(int delta)
+{
+    ASSERT(!isDirty());
+    removeFromTextBlobCache(this);
+    m_start += delta;
+}
+
 void InlineTextBox::markDirty()
 {
     // FIXME: Is it actually possible to try and paint a dirty InlineTextBox?
-    if (gTextBlobCache)
-        gTextBlobCache->remove(this);
+    removeFromTextBlobCache(this);
 
     m_len = 0;
     m_start = 0;
     InlineBox::markDirty();
 }
 
 LayoutRect InlineTextBox::logicalOverflowRect() const
 {
     if (knownToHaveNoOverflow() || !gTextBoxesWithOverflow)
         return enclosingIntRect(logicalFrameRect());
@@ skipping 1209 matching lines @@
     printedCharacters = fprintf(stderr, "\t%s %p", obj.renderName(), &obj);
     const int rendererCharacterOffset = 24;
     for (; printedCharacters < rendererCharacterOffset; printedCharacters++)
         fputc(' ', stderr);
     fprintf(stderr, "(%d,%d) \"%s\"\n", start(), start() + len(), value.utf8().data());
 }
 
 #endif
 
 } // namespace blink