Fix TextIterator's behavior with first-letter

third_party/WebKit/Source/core/editing/iterators/TextIteratorTextState.h

Index: third_party/WebKit/Source/core/editing/iterators/TextIteratorTextState.h
diff --git a/third_party/WebKit/Source/core/editing/iterators/TextIteratorTextState.h b/third_party/WebKit/Source/core/editing/iterators/TextIteratorTextState.h
index 03a122c9a3f180e8a36aacb3865187b0e17a7cd0..fc4cb53757fb3ccc18b5bd82606105dca4617645 100644
--- a/third_party/WebKit/Source/core/editing/iterators/TextIteratorTextState.h
+++ b/third_party/WebKit/Source/core/editing/iterators/TextIteratorTextState.h
@@ -68,6 +68,7 @@ class CORE_EXPORT TextIteratorTextState {
   Node* positionNode() const { return m_positionNode; }
   bool hasEmitted() const { return m_hasEmitted; }
   UChar lastCharacter() const { return m_lastCharacter; }
+  int textStartOffset() const { return m_textStartOffset; }
   void resetRunInformation() {
     m_positionNode = nullptr;
     m_textLength = 0;
@@ -98,6 +99,10 @@ class CORE_EXPORT TextIteratorTextState {
   bool m_hasEmitted;
   UChar m_lastCharacter;
   bool m_emitsOriginalText;
+
+  // Stores the length of :first-letter when we are at the remaining text.
+  // Equals to 0 in all other cases.
+  int m_textStartOffset;
 };
 
 }  // namespace blink