Prevent default actions for JS-generated mouse events other than click

Source/core/dom/Node.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004-2011, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 44 matching lines @@
 class Event;
 class EventDispatchMediator;
 class EventListener;
 class ExceptionState;
 class FloatPoint;
 class LocalFrame;
 class HTMLInputElement;
 class HTMLQualifiedName;
 class IntRect;
 class KeyboardEvent;
+class MouseEvent;
 class NSResolver;
 class NameNodeList;
 class NamedNodeMap;
 class NodeEventContext;
 class NodeList;
 class NodeListsNodeData;
 class NodeRareData;
 class PlatformGestureEvent;
 class PlatformKeyboardEvent;
 class PlatformMouseEvent;
@@ skipping 556 matching lines @@
     virtual bool removeEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture = false) override;
     virtual void removeAllEventListeners() override;
     void removeAllEventListenersRecursively();
 
     // Handlers to do/undo actions on the target node before an event is dispatched to it and after the event
     // has been dispatched.  The data pointer is handed back by the preDispatch and passed to postDispatch.
     virtual void* preDispatchEventHandler(Event*) { return nullptr; }
     virtual void postDispatchEventHandler(Event*, void* /*dataFromPreDispatch*/) { }
 
     using EventTarget::dispatchEvent;
+    // This dispatchEvent override is intended to only be used for events dispatched from script
     virtual bool dispatchEvent(PassRefPtrWillBeRawPtr<Event>) override;
 
     void dispatchScopedEvent(PassRefPtrWillBeRawPtr<Event>);
     void dispatchScopedEventDispatchMediator(PassRefPtrWillBeRawPtr<EventDispatchMediator>);
 
     virtual void handleLocalEvents(Event&);
 
     void dispatchSubtreeModifiedEvent();
     bool dispatchDOMActivateEvent(int detail, PassRefPtrWillBeRawPtr<Event> underlyingEvent);
 
     bool dispatchKeyEvent(const PlatformKeyboardEvent&);
     bool dispatchWheelEvent(const PlatformWheelEvent&);
     bool dispatchMouseEvent(const PlatformMouseEvent&, const AtomicString& eventType, int clickCount = 0, Node* relatedTarget = nullptr);
+    bool dispatchMouseEvent(PassRefPtrWillBeRawPtr<MouseEvent>);
     bool dispatchGestureEvent(const PlatformGestureEvent&);
     bool dispatchTouchEvent(PassRefPtrWillBeRawPtr<TouchEvent>);
 
     void dispatchSimulatedClick(Event* underlyingEvent, SimulatedClickMouseEventOptions = SendNoEvents);
 
     void dispatchInputEvent();
 
     // Perform the default action for an event.
     virtual void defaultEventHandler(Event*);
     virtual void willCallDefaultEventHandler(const Event&);
@@ skipping 251 matching lines @@
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showNode(const blink::Node*);
 void showTree(const blink::Node*);
 void showNodePath(const blink::Node*);
 #endif
 
 #endif // Node_h