Introduce composed tree version of firstEditableVisiblePositionAfterPositionInRoot()

Source/core/editing/EditingUtilities.cpp

Index: Source/core/editing/EditingUtilities.cpp
diff --git a/Source/core/editing/EditingUtilities.cpp b/Source/core/editing/EditingUtilities.cpp
index 8474bbb25f2e4b7baa644874eacbac8f7a6be2ae..db235eed5f42dcaa57c41212dca318f9bfaa4fbf 100644
--- a/Source/core/editing/EditingUtilities.cpp
+++ b/Source/core/editing/EditingUtilities.cpp
@@ -451,6 +451,11 @@ VisiblePosition firstEditableVisiblePositionAfterPositionInRoot(const Position&
     return createVisiblePosition(firstEditablePositionAfterPositionInRoot(position, highestRoot));
 }
 
+VisiblePositionInComposedTree firstEditableVisiblePositionAfterPositionInRoot(const PositionInComposedTree& position, ContainerNode* highestRoot)
+{
+    return createVisiblePosition(firstEditablePositionAfterPositionInRoot(position, highestRoot));
+}
+
 template <typename Strategy>
 PositionAlgorithm<Strategy> firstEditablePositionAfterPositionInRootAlgorithm(const PositionAlgorithm<Strategy>& position, Node* highestRoot)
 {