ALL-IN-ONE: Optimization to previousBoundary() and nextBoundary()

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 1262719d2b8ffffc4e32385e7f2203ba29487869..3393c803cb3bceb2a8989290f6db8e7f0339a0f6 100644
--- a/third_party/WebKit/Source/core/editing/iterators/TextIterator.h
+++ b/third_party/WebKit/Source/core/editing/iterators/TextIterator.h
@@ -54,6 +54,10 @@ template<typename Strategy>
 class CORE_TEMPLATE_CLASS_EXPORT TextIteratorAlgorithm {
     STACK_ALLOCATED();
 public:
+
+    using PositionType = PositionTemplate<Strategy>;
+    static const TextIteratorDirection direction = TextIteratorDirection::TextIteratorForward;
+
     // [start, end] indicates the document range that the iteration should take place within (both ends inclusive).
     TextIteratorAlgorithm(const PositionTemplate<Strategy>& start, const PositionTemplate<Strategy>& end, TextIteratorBehaviorFlags = TextIteratorDefaultBehavior);
     ~TextIteratorAlgorithm();
@@ -75,6 +79,7 @@ public:
 
     const TextIteratorTextState& text() const { return m_textState; }
     int length() const { return m_textState.length(); }
+    UChar characterAt(unsigned index) const { return m_textState.characterAt(index); }
 
     bool breaksAtReplacedElement() { return !(m_behavior & TextIteratorDoesNotBreakAtReplacedElement); }