Fix TextIterator's behavior with first-letter

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

Index: third_party/WebKit/Source/core/editing/iterators/TextIterator.h
diff --git a/third_party/WebKit/Source/core/editing/iterators/TextIterator.h b/third_party/WebKit/Source/core/editing/iterators/TextIterator.h
index 92a004942be699cf510908f7a81f7e4840795c6f..6da02720e0a95586911d8b7acf75977b8b04c7b0 100644
--- a/third_party/WebKit/Source/core/editing/iterators/TextIterator.h
+++ b/third_party/WebKit/Source/core/editing/iterators/TextIterator.h
@@ -138,6 +138,10 @@ class CORE_TEMPLATE_CLASS_EXPORT TextIteratorAlgorithm {
   bool handleNonTextNode();
   void handleTextBox();
   void handleTextNodeFirstLetter(LayoutTextFragment*);
+  bool prepareForFirstLetterInitialization();

[yosin_UTC9, 2016/12/01 09:41:42]

Could you add a comment to explain what |bool| result is?

[Xiaocheng, 2016/12/01 10:09:56]

Done.

+  bool hasNotAdvancedToStartPosition();
+  int adjustedStartForFirstLetter(Node*, LayoutText*, int, int);
+  int adjustedStartForRemainingText(Node*, LayoutText*, int, int);
   void spliceBuffer(UChar,
                     Node* textNode,
                     Node* offsetBaseNode,
@@ -257,6 +261,11 @@ class CORE_TEMPLATE_CLASS_EXPORT TextIteratorAlgorithm {
   // |SelectionToStringWithShadowTree|, we should not use other purpose.
   bool m_handleShadowRoot;
 
+  // Used for adjusting the initialization and the output when the start
+  // container is a text node with :first-letter.
+  int m_firstLetterStartOffset;
+  int m_remainingTextStartOffset;
+
   // Contains state of emitted text.
   TextIteratorTextState m_textState;
 };