Fire an accessible click event when a web node is clicked on.

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

 /*
  * Copyright (C) 2014, 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 70 matching lines @@
     void handleFocusedUIElementChanged(Node* oldFocusedNode, Node* newFocusedNode) override;
     void handleInitialFocus() override;
     void handleTextFormControlChanged(Node*) override;
     void handleEditableTextContentChanged(Node*) override;
     void handleValueChanged(Node*) override;
     void handleUpdateActiveMenuOption(LayoutMenuList*, int optionIndex) override;
     void didShowMenuListPopup(LayoutMenuList*) override;
     void didHideMenuListPopup(LayoutMenuList*) override;
     void handleLoadComplete(Document*) override;
     void handleLayoutComplete(Document*) override;
+    void handleClicked(Node*) override;
 
     void setCanvasObjectBounds(Element*, const LayoutRect&) override;
 
     void inlineTextBoxesUpdated(LayoutObject*) override;
 
     // Called when the scroll offset changes.
     void handleScrollPositionChanged(FrameView*) override;
     void handleScrollPositionChanged(LayoutObject*) override;
 
     // Called when scroll bars are added / removed (as the view resizes).
@@ skipping 144 matching lines @@
 // This is the only subclass of AXObjectCache.
 DEFINE_TYPE_CASTS(AXObjectCacheImpl, AXObjectCache, cache, true, true);
 
 bool nodeHasRole(Node*, const String& role);
 // This will let you know if aria-hidden was explicitly set to false.
 bool isNodeAriaVisible(Node*);
 
 } // namespace blink
 
 #endif