Make inSameLine() in VisibleUnits.cpp to work with positions in composed tree

Source/core/editing/RenderedPosition.cpp

Index: Source/core/editing/RenderedPosition.cpp
diff --git a/Source/core/editing/RenderedPosition.cpp b/Source/core/editing/RenderedPosition.cpp
index 4a358120e64408c4e0a71b6f852c03d224a885fb..cd6086fd44d5db6846388dda8aa94afa1d95c752 100644
--- a/Source/core/editing/RenderedPosition.cpp
+++ b/Source/core/editing/RenderedPosition.cpp
@@ -97,6 +97,11 @@ RenderedPosition::RenderedPosition(const Position& position, EAffinity affinity)
         m_layoutObject = layoutObjectFromPosition(position);
 }
 
+RenderedPosition::RenderedPosition(const PositionInComposedTree& position, EAffinity affinity)
+    : RenderedPosition(toPositionInDOMTree(position), affinity)
+{
+}
+
 InlineBox* RenderedPosition::prevLeafChild() const
 {
     if (m_prevLeafChild == uncachedInlineBox())