Introduce EphemeralRange::nodes() helper to traverse over a range.

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

Index: third_party/WebKit/Source/core/editing/EphemeralRange.cpp
diff --git a/third_party/WebKit/Source/core/editing/EphemeralRange.cpp b/third_party/WebKit/Source/core/editing/EphemeralRange.cpp
index a1d9ff5e92e73a3e629236f7b19e5c7bb1e73a8c..dbdc174a3683778b3ffa76e9d1036cfdf2340a2b 100644
--- a/third_party/WebKit/Source/core/editing/EphemeralRange.cpp
+++ b/third_party/WebKit/Source/core/editing/EphemeralRange.cpp
@@ -145,6 +145,26 @@ Range* createRange(const EphemeralRange& range)
     return Range::create(range.document(), range.startPosition(), range.endPosition());
 }
 
+internal::RangeTraversal inRange(const Position& start, const Position& end)
+{
+    return internal::RangeTraversal(start.nodeAsRangeFirstNode(), end.nodeAsRangePastLastNode());
+}
+
+internal::RangeTraversalInFlatTree inRange(const PositionInFlatTree& start, const PositionInFlatTree& end)
+{
+    return internal::RangeTraversalInFlatTree(start.nodeAsRangeFirstNode(), end.nodeAsRangePastLastNode());
+}
+
+internal::RangeTraversal inRange(const EphemeralRange& range)
+{
+    return inRange(range.startPosition(), range.endPosition());
+}
+
+internal::RangeTraversalInFlatTree inRange(const EphemeralRangeInFlatTree& range)
+{
+    return inRange(range.startPosition(), range.endPosition());
+}
+
 template class CORE_TEMPLATE_EXPORT EphemeralRangeTemplate<EditingStrategy>;
 template class CORE_TEMPLATE_EXPORT EphemeralRangeTemplate<EditingInFlatTreeStrategy>;