Explicit management of FrameSelection availability

third_party/WebKit/Source/core/editing/SelectionEditor.h

Index: third_party/WebKit/Source/core/editing/SelectionEditor.h
diff --git a/third_party/WebKit/Source/core/editing/SelectionEditor.h b/third_party/WebKit/Source/core/editing/SelectionEditor.h
index f3417cb7be47604311f75aec627584d86fde7b37..b24d494f97609b544441cec2b5e9ab08a3512e8e 100644
--- a/third_party/WebKit/Source/core/editing/SelectionEditor.h
+++ b/third_party/WebKit/Source/core/editing/SelectionEditor.h
@@ -55,9 +55,11 @@ public:
     void setVisibleSelection(const VisibleSelection&, FrameSelection::SetSelectionOptions);
     void setVisibleSelection(const VisibleSelectionInFlatTree&, FrameSelection::SetSelectionOptions);
 
-    void setIsDirectional(bool);
     void setWithoutValidation(const Position& base, const Position& extent);
 
+    void documentAttached(Document*);
+    void documentDetached(const Document&);
+
     // If this FrameSelection has a logical range which is still valid, this
     // function return its clone. Otherwise, the return value from underlying
     // |VisibleSelection|'s |firstRange()| is returned.
@@ -76,8 +78,13 @@ public:
 private:
     explicit SelectionEditor(FrameSelection&);
 
+    const Document& document() const;
     LocalFrame* frame() const;
 
+    void clearVisibleSelection();
+    bool shouldAlwaysUseDirectionalSelection() const;
+
+    Member<Document> m_document;
     Member<FrameSelection> m_frameSelection;
 
     VisibleSelection m_selection;