Add a UseCounter for selection intersection in Selection.addRange().

third_party/WebKit/Source/core/editing/DOMSelection.cpp

Index: third_party/WebKit/Source/core/editing/DOMSelection.cpp
diff --git a/third_party/WebKit/Source/core/editing/DOMSelection.cpp b/third_party/WebKit/Source/core/editing/DOMSelection.cpp
index b3c41e3b4d5e38d117f47a61430277b5aa3207b0..4e5fc3c3eafdf43a05406ea05571836019927d53 100644
--- a/third_party/WebKit/Source/core/editing/DOMSelection.cpp
+++ b/third_party/WebKit/Source/core/editing/DOMSelection.cpp
@@ -496,6 +496,7 @@ void DOMSelection::addRange(Range* newRange) {
   // really do the same, since we don't support discontiguous selection. Further
   // discussions at
   // <https://code.google.com/p/chromium/issues/detail?id=353069>.
+  UseCounter::count(frame(), UseCounter::SelectionAddRangeIntersect);
 
   Range* start = originalRange->compareBoundaryPoints(
                      Range::kStartToStart, newRange, ASSERT_NO_EXCEPTION) < 0