Make copyTextTo() of text iterators check the length parameter

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

Index: third_party/WebKit/Source/core/editing/iterators/SimplifiedBackwardsTextIterator.h
diff --git a/third_party/WebKit/Source/core/editing/iterators/SimplifiedBackwardsTextIterator.h b/third_party/WebKit/Source/core/editing/iterators/SimplifiedBackwardsTextIterator.h
index 89f2634b4d5076aa30723d765105dbf706318ad2..9102bb64934ed45ed7b71d3a3d37567a15edd6b7 100644
--- a/third_party/WebKit/Source/core/editing/iterators/SimplifiedBackwardsTextIterator.h
+++ b/third_party/WebKit/Source/core/editing/iterators/SimplifiedBackwardsTextIterator.h
@@ -61,6 +61,7 @@ public:
     // Calculate the minimum |actualLength >= minLength| such that code units
     // with offset range [position, position + actualLength) are whole code
     // points. Prepend these code points to |output| and return |actualLength|.
+    // TODO(xiaochengh): Use (start, end) instead of (start, length).
     int copyTextTo(BackwardsTextBuffer* output, int position, int minLength) const;
     // TODO(xiaochengh): Avoid default parameters.
     int copyTextTo(BackwardsTextBuffer* output, int position = 0) const;