Devtools: Create layout editor experiment

Source/core/inspector/InspectorHighlight.h

 // Copyright 2015 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 InspectorHighlight_h
 #define InspectorHighlight_h
 
 #include "core/CoreExport.h"
 #include "core/InspectorTypeBuilder.h"
 #include "platform/geometry/FloatQuad.h"
@@ skipping 14 matching lines @@
     Color padding;
     Color border;
     Color margin;
     Color eventTarget;
     Color shape;
     Color shapeMargin;
 
     bool showInfo;
     bool showRulers;
     bool showExtensionLines;
+    bool showLayoutEditor;
 };
 
 class CORE_EXPORT InspectorHighlight {
     STACK_ALLOCATED();
 public:
     InspectorHighlight(Node*, const InspectorHighlightConfig&, bool appendElementInfo);
     InspectorHighlight();
     ~InspectorHighlight();
 
     static bool getBoxModel(Node*, RefPtr<TypeBuilder::DOM::BoxModel>&);
@@ skipping 10 matching lines @@
 
     RefPtr<JSONObject> m_elementInfo;
     RefPtr<JSONArray> m_highlightPaths;
     bool m_showRulers;
     bool m_showExtensionLines;
 };
 
 } // namespace blink
 
 #endif // InspectorHighlight_h