Introduce composed tree version of isEndOfEditableOrNonEditableContent()

Source/core/editing/VisibleUnits.cpp

Index: Source/core/editing/VisibleUnits.cpp
diff --git a/Source/core/editing/VisibleUnits.cpp b/Source/core/editing/VisibleUnits.cpp
index 5f990354180ff02420d088e62727d991d5d2bf98..94ec24e6b40cdf66f3ca2ed1aaca580b37a9a969 100644
--- a/Source/core/editing/VisibleUnits.cpp
+++ b/Source/core/editing/VisibleUnits.cpp
@@ -1622,11 +1622,22 @@ VisiblePosition endOfEditableContent(const VisiblePosition& visiblePosition)
     return createVisiblePosition(lastPositionInNode(highestRoot));
 }
 
-bool isEndOfEditableOrNonEditableContent(const VisiblePosition& p)
+template <typename Strategy>
+static bool isEndOfEditableOrNonEditableContentAlgorithm(const VisiblePositionTemplate<Strategy>& p)
 {
     return p.isNotNull() && nextPositionOf(p).isNull();
 }
 
+bool isEndOfEditableOrNonEditableContent(const VisiblePosition& position)
+{
+    return isEndOfEditableOrNonEditableContentAlgorithm<EditingStrategy>(position);
+}
+
+bool isEndOfEditableOrNonEditableContent(const VisiblePositionInComposedTree& position)
+{
+    return isEndOfEditableOrNonEditableContentAlgorithm<EditingInComposedTreeStrategy>(position);
+}
+
 VisiblePosition leftBoundaryOfLine(const VisiblePosition& c, TextDirection direction)
 {
     return direction == LTR ? logicalStartOfLine(c) : logicalEndOfLine(c);