Non passive touch end or touch cancel listeners should not block scroll.

third_party/WebKit/Source/core/testing/Internals.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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.
@@ skipping 176 matching lines @@
     int lastSpellCheckRequestSequence(Document*, ExceptionState&);
     int lastSpellCheckProcessedSequence(Document*, ExceptionState&);
 
     Vector<AtomicString> userPreferredLanguages() const;
     void setUserPreferredLanguages(const Vector<String>&);
 
     unsigned activeDOMObjectCount(Document*);
     unsigned wheelEventHandlerCount(Document*);
     unsigned scrollEventHandlerCount(Document*);
     unsigned touchEventHandlerCount(Document*);
+    unsigned touchEndOrCancelEventHandlerCount(Document*);
     LayerRectList* touchEventTargetLayerRects(Document*, ExceptionState&);
 
     bool executeCommand(Document*, const String& name, const String& value, ExceptionState&);
 
     AtomicString htmlNamespace();
     Vector<AtomicString> htmlTags();
     AtomicString svgNamespace();
     Vector<AtomicString> svgTags();
 
     // This is used to test rect based hit testing like what's done on touch screens.
@@ skipping 207 matching lines @@
 
     DocumentMarker* markerAt(Node*, const String& markerType, unsigned index, ExceptionState&);
     Member<InternalRuntimeFlags> m_runtimeFlags;
 
     IterationSource* startIteration(ScriptState*, ExceptionState&) override;
 };
 
 } // namespace blink
 
 #endif // Internals_h