Fix bugs in accessible name calculation code exposed by Bryan Garaventa's test files.

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 913 matching lines @@
 
 protected:
     AXID m_id;
     AXObjectVector m_children;
     mutable bool m_haveChildren;
     AccessibilityRole m_role;
     AXObjectInclusion m_lastKnownIsIgnoredValue;
     LayoutRect m_explicitElementRect;
 
     // Used only inside textAlternative():
+    static String collapseWhitespace(const String&);
     static String recursiveTextAlternative(const AXObject&, bool inAriaLabelledByTraversal, AXObjectSet& visited);
+    bool isHiddenForTextAlternativeCalculation() const;
     String ariaTextAlternative(bool recursive, bool inAriaLabelledByTraversal, AXObjectSet& visited, AXNameFrom&, AXRelatedObjectVector*, NameSources*, bool* foundTextAlternative) const;
     String textFromElements(bool inAriaLabelledByTraversal, AXObjectSet& visited, WillBeHeapVector<RawPtrWillBeMember<Element>>& elements, AXRelatedObjectVector* relatedObjects) const;
     void tokenVectorFromAttribute(Vector<String>&, const QualifiedName&) const;
     void elementsFromAttribute(WillBeHeapVector<RawPtrWillBeMember<Element>>& elements, const QualifiedName&) const;
     void ariaLabelledbyElementVector(WillBeHeapVector<RawPtrWillBeMember<Element>>& elements) const;
     String textFromAriaLabelledby(AXObjectSet& visited, AXRelatedObjectVector* relatedObjects) const;
     String textFromAriaDescribedby(AXRelatedObjectVector* relatedObjects) const;
 
     virtual const AXObject* inheritsPresentationalRoleFrom() const { return 0; }
 
@@ skipping 34 matching lines @@
 #define DEFINE_AX_OBJECT_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, AXObject, object, object->predicate, object.predicate)
 
 } // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::IgnoredReason);
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::NameSource);
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::DescriptionSource);
 
 #endif // AXObject_h