[WIP][b:eae_mywip_paint] Paint Selection NG.

third_party/WebKit/Source/core/layout/ng/inline/ng_inline_node_data.h

 // Copyright 2017 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 NGInlineNodeData_h
 #define NGInlineNodeData_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/inline/ng_inline_item.h"
 #include "platform/wtf/Vector.h"
 
 namespace blink {
 
 class LayoutBox;
 
 // Data which is required for inline nodes.
 struct CORE_EXPORT NGInlineNodeData {
  private:
   friend class NGInlineNode;
   friend class NGInlineNodeForTest;
+  friend class NGTextOffsetMap;
 
   // Text content for all inline items represented by a single NGInlineNode.
   // Encoded either as UTF-16 or latin-1 depending on the content.
   String text_content_;
   Vector<NGInlineItem> items_;
 
   // next_sibling_ is only valid after NGInlineNode::PrepareLayout is called.
   // Calling NGInlineNode::NextSibling will trigger this.
   LayoutBox* next_sibling_;
 
   // start_inline_ must always be reset within the constructor of NGInlineNode.
   LayoutObject* start_inline_;
 
   // TODO(kojii): This should move to somewhere else when we move PrepareLayout
   // to the correct place.
   bool is_bidi_enabled_ = false;
 };
 
 }  // namespace blink
 
 #endif  // NGInlineNode_h