Added some methods to abstract inline text boxes.

third_party/WebKit/Source/modules/accessibility/AXInlineTextBox.h

 /*
  * Copyright (C) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 16 matching lines @@
  */
 
 #ifndef AXInlineTextBox_h
 #define AXInlineTextBox_h
 
 #include "core/layout/line/AbstractInlineTextBox.h"
 #include "modules/accessibility/AXObject.h"
 
 namespace blink {
 
+class Node;
 class AXObjectCacheImpl;
 
 class AXInlineTextBox final : public AXObject {
   WTF_MAKE_NONCOPYABLE(AXInlineTextBox);
 
  private:
   AXInlineTextBox(PassRefPtr<AbstractInlineTextBox>, AXObjectCacheImpl&);
 
  public:
   static AXInlineTextBox* Create(PassRefPtr<AbstractInlineTextBox>,
                                  AXObjectCacheImpl&);
 
+ protected:
   void Init() override;
   void Detach() override;
+  bool IsDetached() const override { return !inline_text_box_; }
+  bool IsAXInlineTextBox() const override { return true; }
 
+ public:
   AccessibilityRole RoleValue() const override { return kInlineTextBoxRole; }
   String GetName(AXNameFrom&,
                  AXObject::AXObjectVector* name_objects) const override;
   void TextCharacterOffsets(Vector<int>&) const override;
   void GetWordBoundaries(Vector<AXRange>&) const override;
   void GetRelativeBounds(AXObject** out_container,
                          FloatRect& out_bounds_in_container,
                          SkMatrix44& out_container_transform) const override;
   AXObject* ComputeParent() const override;
   AccessibilityTextDirection GetTextDirection() const override;
+  Node* GetNode() const override { return inline_text_box_->GetNode(); }
   AXObject* NextOnLine() const override;
   AXObject* PreviousOnLine() const override;
 
  private:
   RefPtr<AbstractInlineTextBox> inline_text_box_;
 
   bool ComputeAccessibilityIsIgnored(IgnoredReasons* = nullptr) const override;
 };
 
 }  // namespace blink
 
 #endif  // AXInlineTextBox_h