Implement the inert attribute

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

 /*
  * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nuanti Ltd.
  *
  * 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.
@@ skipping 377 matching lines @@
   AXDescriptionFromUninitialized = -1,
   AXDescriptionFromAttribute = 0,
   AXDescriptionFromContents,
   AXDescriptionFromRelatedElement,
 };
 
 enum AXIgnoredReason {
   AXActiveModalDialog,
   AXAncestorDisallowsChild,
   AXAncestorIsLeafNode,
-  AXAriaHidden,
-  AXAriaHiddenRoot,
+  AXAriaHiddenElement,
+  AXAriaHiddenSubtree,

[esprehn, 2017/02/15 02:15:01]

I assume reordering this enum is safe?

[aboxhall, 2017/02/15 04:01:32]

Yes - only used by devtools, serialized to a string (not order dependent).

   AXEmptyAlt,
   AXEmptyText,
-  AXInert,
+  AXInertElement,
+  AXInertSubtree,
   AXInheritsPresentation,
   AXLabelContainer,
   AXLabelFor,
   AXNotRendered,
   AXNotVisible,
   AXPresentationalRole,
   AXProbablyPresentational,
   AXStaticTextUsedAsNameFor,
   AXUninteresting
 };
@@ skipping 656 matching lines @@
   virtual const AXObject* inheritsPresentationalRoleFrom() const { return 0; }
 
   virtual bool nameFromContents() const;
 
   AccessibilityRole buttonRoleType() const;
 
   virtual LayoutObject* layoutObjectForRelativeBounds() const {
     return nullptr;
   }
 
+  const AXObject* inertRoot() const;
+
   mutable Member<AXObject> m_parent;
 
   // The following cached attribute values (the ones starting with m_cached*)
   // are only valid if m_lastModificationCount matches
   // AXObjectCacheImpl::modificationCount().
   mutable int m_lastModificationCount;
   mutable RGBA32 m_cachedBackgroundColor;
   mutable bool m_cachedIsIgnored : 1;
   mutable bool m_cachedIsInertOrAriaHidden : 1;
   mutable bool m_cachedIsDescendantOfLeafNode : 1;
@@ skipping 17 matching lines @@
   static unsigned s_numberOfLiveAXObjects;
 };
 
 #define DEFINE_AX_OBJECT_TYPE_CASTS(thisType, predicate)           \
   DEFINE_TYPE_CASTS(thisType, AXObject, object, object->predicate, \
                     object.predicate)
 
 }  // namespace blink
 
 #endif  // AXObject_h