Send lostpointercapture on touch capturing

third_party/WebKit/Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2633 matching lines @@
     insertAdjacent(where, fragment.get(), exceptionState);
 }
 
 void Element::setPointerCapture(int pointerId, ExceptionState& exceptionState)
 {
     if (document().frame()) {
         if (!document().frame()->eventHandler().isPointerEventActive(pointerId))
             exceptionState.throwDOMException(InvalidPointerId, "InvalidPointerId");
         else if (!inDocument())
             exceptionState.throwDOMException(InvalidStateError, "InvalidStateError");
+        // TODO(crbug.com/579553): This next "else if" is a hack to notify JS that we don't (yet) support
+        // explicit set/release of touch pointers (which are implicitly captured for performance reasons).
+        else if (document().frame()->eventHandler().getPointerEventType(pointerId) == WebPointerProperties::PointerType::Touch)
+            exceptionState.throwDOMException(InvalidPointerId, "InvalidPointerId");
         else
             document().frame()->eventHandler().setPointerCapture(pointerId, this);
     }
 }
 
 void Element::releasePointerCapture(int pointerId, ExceptionState& exceptionState)
 {
     if (document().frame()) {
         if (!document().frame()->eventHandler().isPointerEventActive(pointerId))
             exceptionState.throwDOMException(InvalidPointerId, "InvalidPointerId");
+        // TODO(crbug.com/579553): This next "else if" is a hack to notify JS that we don't (yet) support
+        // explicit set/release of touch pointers (which are implicitly captured for performance reasons).
+        else if (document().frame()->eventHandler().getPointerEventType(pointerId) == WebPointerProperties::PointerType::Touch)
+            exceptionState.throwDOMException(InvalidPointerId, "InvalidPointerId");
         else
             document().frame()->eventHandler().releasePointerCapture(pointerId, this);
     }
 }
 
 String Element::innerText()
 {
     // We need to update layout, since plainText uses line boxes in the layout tree.
     document().updateLayoutIgnorePendingStylesheets();
 
@@ skipping 995 matching lines @@
 {
 #if ENABLE(OILPAN)
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
 #endif
     ContainerNode::trace(visitor);
 }
 
 } // namespace blink