Oilpan: move editing objects to the heap.

Source/core/editing/VisibleSelection.h

Index: Source/core/editing/VisibleSelection.h
diff --git a/Source/core/editing/VisibleSelection.h b/Source/core/editing/VisibleSelection.h
index c14630c15d700258279bc14bf5c7d10716c4e681..9294139e651613601f43267f74a3c4058eae8682 100644
--- a/Source/core/editing/VisibleSelection.h
+++ b/Source/core/editing/VisibleSelection.h
@@ -39,6 +39,7 @@ const EAffinity SEL_DEFAULT_AFFINITY = DOWNSTREAM;
 enum SelectionDirection { DirectionForward, DirectionBackward, DirectionRight, DirectionLeft };
 
 class VisibleSelection {
+    ALLOW_ONLY_INLINE_ALLOCATION();

[haraken, 2014/05/28 15:35:25]

Just help me understand: Who uses VisibleSelection in collections? Can this
probably be DISALLOW_ALLOCATION() ?

[sof, 2014/05/28 22:06:06]

Yes, no more than DISALLOW_ALLOCATION() is needed.

 public:
     VisibleSelection();
 
@@ -128,6 +129,8 @@ public:
     void clearChangeObserver();
     void didChange(); // Fire the change observer, if any.
 
+    void trace(Visitor*);
+
 #ifndef NDEBUG
     void debugPosition() const;
     void formatForDebugger(char* buffer, unsigned length) const;