Let FrameSelection::localCaretRect on a text input field avoid synchronous layout.

Source/core/editing/PositionWithAffinity.h

Index: Source/core/editing/PositionWithAffinity.h
diff --git a/Source/core/editing/PositionWithAffinity.h b/Source/core/editing/PositionWithAffinity.h
index 408c2e9c7d2515fbb87d3d9a9be20de3102b52fc..d281bf4927b51000fc85b02b7a223fddd9729c73 100644
--- a/Source/core/editing/PositionWithAffinity.h
+++ b/Source/core/editing/PositionWithAffinity.h
@@ -20,6 +20,9 @@ public:
     EAffinity affinity() const { return m_affinity; }
     const Position& position() const { return m_position; }
 
+    // Rect is local to the returned renderer
+    LayoutRect localCaretRect(RenderObject*&) const;

[yosin_UTC9, 2014/07/29 07:00:20]

We would like to keep PositionWithAninity as simple as possible and keep away
from rendering, which is different layer.

This function should be in VisibleUnit.{cpp,h}.

[yoichio, 2014/07/29 08:05:17]

Done.

+
     void trace(Visitor*);
 
 private: