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

Source/core/editing/PositionWithAffinity.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file./*
 
 #ifndef PositionWithAffinity_h
 #define PositionWithAffinity_h
 
 #include "core/dom/Position.h"
 #include "core/editing/TextAffinity.h"
 
 namespace blink {
 
 class PositionWithAffinity {
     DISALLOW_ALLOCATION();
 public:
     PositionWithAffinity(const Position&, EAffinity = DOWNSTREAM);
     PositionWithAffinity();
     ~PositionWithAffinity();
 
     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:
     Position m_position;
     EAffinity m_affinity;
 };
 
 } // namespace blink
 
 #endif // PositionWithAffinity_h