Clarify devtools console log when a passive event listener is preventDefaulted.

third_party/WebKit/Source/core/events/TouchEvent.cpp

 /*
  * Copyright 2008, The Android Open Source Project
  * Copyright (C) 2012 Research In Motion Limited. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *  * Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  * Redistributions in binary form must reproduce the above copyright
@@ skipping 186 matching lines @@
     return true;
 }
 
 void TouchEvent::preventDefault()
 {
     UIEventWithKeyState::preventDefault();
 
     // A common developer error is to wait too long before attempting to stop
     // scrolling by consuming a touchmove event. Generate a warning if this
     // event is uncancelable.
-    if (!cancelable() && view() && view()->isLocalDOMWindow() && view()->frame()) {
+    if (!cancelable() && handlingPassive() == PassiveMode::NotPassive && view() && view()->isLocalDOMWindow() && view()->frame()) {
         toLocalDOMWindow(view())->frame()->console().addMessage(ConsoleMessage::create(JSMessageSource, WarningMessageLevel,
             "Ignored attempt to cancel a " + type() + " event with cancelable=false, for example because scrolling is in progress and cannot be interrupted."));
     }
 }
 
 void TouchEvent::doneDispatchingEventAtCurrentTarget()
 {
     // Do not log for non-cancelable events, events that don't block
     // scrolling, have more than one touch point or aren't on the main frame.
     if (!cancelable() || !m_firstTouchMoveOrStart || !(m_touches && m_touches->length() == 1) || !(view() && view()->frame() && view()->frame()->isMainFrame()))
@@ skipping 32 matching lines @@
     return toTouchEvent(EventDispatchMediator::event());
 }
 
 DispatchEventResult TouchEventDispatchMediator::dispatchEvent(EventDispatcher& dispatcher) const
 {
     event().eventPath().adjustForTouchEvent(event());
     return dispatcher.dispatch();
 }
 
 } // namespace blink