[Layout API] Introduce Layout API shim and use in LayerClipRecorderTest.cpp

third_party/WebKit/Source/core/layout/api/LayoutItem.h

 // Copyright 2016 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 LayoutItem_h
 #define LayoutItem_h
 
 #include "core/inspector/InspectorTraceEvents.h"
 #include "core/layout/LayoutObject.h"
 
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class FrameView;
+class LayoutAPIShim;
 class Node;
 
 class LayoutItem {
     DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
 public:
     explicit LayoutItem(LayoutObject* layoutObject)
         : m_layoutObject(layoutObject)
     {
     }
 
@@ skipping 224 matching lines @@
     {
         return m_layoutObject->resolveColor(colorProperty);
     }
 
 protected:
     LayoutObject* layoutObject() { return m_layoutObject; }
     const LayoutObject* layoutObject() const { return m_layoutObject; }
 
 private:
     LayoutObject* m_layoutObject;
+
+    friend class LayoutAPIShim;
 };
 
 } // namespace blink
 
 #endif // LayoutItem_h