Pass start/length at InlineTextBox construction time.

Source/core/rendering/InlineTextBox.cpp

Index: Source/core/rendering/InlineTextBox.cpp
diff --git a/Source/core/rendering/InlineTextBox.cpp b/Source/core/rendering/InlineTextBox.cpp
index 24b24c55749c3ca464c6740252b51483da5dfaaf..d595b8cd16b4345f0dac98da47928e714be96d8c 100644
--- a/Source/core/rendering/InlineTextBox.cpp
+++ b/Source/core/rendering/InlineTextBox.cpp
@@ -74,6 +74,12 @@ 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()
@@ -82,16 +88,21 @@ void InlineTextBox::destroy()
 
     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;