Introduce TextBuffer as Output Type of copyTextTo() for Text Iterators

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

Index: third_party/WebKit/Source/core/editing/iterators/TextIterator.cpp
diff --git a/third_party/WebKit/Source/core/editing/iterators/TextIterator.cpp b/third_party/WebKit/Source/core/editing/iterators/TextIterator.cpp
index 0bd2c59c69a47d009ac9805730df94b9cc459c25..eb2d17e05c9280ad9fcc87f057085ee6f0b95339 100644
--- a/third_party/WebKit/Source/core/editing/iterators/TextIterator.cpp
+++ b/third_party/WebKit/Source/core/editing/iterators/TextIterator.cpp
@@ -1112,6 +1112,26 @@ bool TextIteratorAlgorithm<Strategy>::isBetweenSurrogatePair(int position) const
     return position > 0 && position < length() && U16_IS_LEAD(characterAt(position - 1)) && U16_IS_TRAIL(characterAt(position));
 }
 
+template <typename Strategy>
+int TextIteratorAlgorithm<Strategy>::copyTextTo(ForwardsTextBuffer& output, int position, int minLength) const
+{
+    int copiedLength = isBetweenSurrogatePair(position + minLength) ? minLength + 1 : minLength;
+    copyCodeUnitsTo(output, position, copiedLength);
+    return copiedLength;
+}
+
+template <typename Strategy>
+int TextIteratorAlgorithm<Strategy>::copyTextTo(ForwardsTextBuffer& output, int position) const
+{
+    return copyTextTo(output, position, length() - position);
+}
+
+template <typename Strategy>
+void TextIteratorAlgorithm<Strategy>::copyCodeUnitsTo(ForwardsTextBuffer& output, int position, int copyLength) const
+{
+    m_textState.appendTextTo(output, position, copyLength);
+}
+
 // --------
 
 template <typename Strategy>