Communicate whether passive event listeners exist to cc.

third_party/WebKit/Source/core/input/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * 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 86 matching lines @@
 #include "platform/scroll/Scrollbar.h"
 #include "wtf/Assertions.h"
 #include "wtf/CurrentTime.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/TemporaryChange.h"
 
 namespace blink {
 
 namespace {
 
+bool hasTouchHandlers(const EventHandlerRegistry& registry)
+{
+    return registry.hasEventHandlers(EventHandlerRegistry::TouchEventBlocking)
+        || registry.hasEventHandlers(EventHandlerRegistry::TouchEventPassive);
+}
+
 WebInputEventResult mergeEventResult(WebInputEventResult responseA, WebInputEventResult responseB)
 {
     // The ordering of the enumeration is specific. There are times that
     // multiple events fire and we need to combine them into a single
     // result code. The enumeration is based on the level of consumption that
     // is most significant. The enumeration is ordered with smaller specified
     // numbers first. Examples of merged results are:
     // (HandledApplication, HandledSystem) -> HandledSystem
     // (NotHandled, HandledApplication) -> HandledApplication
     static_assert(static_cast<int>(WebInputEventResult::NotHandled) == 0, "WebInputEventResult not ordered");
@@ skipping 3878 matching lines @@
             if (effectiveTouchAction != TouchActionAuto)
                 m_frame->page()->chromeClient().setTouchAction(effectiveTouchAction);
         }
     }
 
     m_touchPressed = !allTouchReleased;
 
     // If there's no document receiving touch events, or no handlers on the
     // document set to receive the events, then we can skip all the rest of
     // this work.
-    if (!m_touchSequenceDocument || !m_touchSequenceDocument->frameHost() || !m_touchSequenceDocument->frameHost()->eventHandlerRegistry().hasEventHandlers(EventHandlerRegistry::TouchEvent) || !m_touchSequenceDocument->frame()) {
+    if (!m_touchSequenceDocument || !m_touchSequenceDocument->frameHost() || !hasTouchHandlers(m_touchSequenceDocument->frameHost()->eventHandlerRegistry()) || !m_touchSequenceDocument->frame()) {
         if (allTouchReleased) {
             m_touchSequenceDocument.clear();
             m_touchSequenceUserGestureToken.clear();
         }
         return WebInputEventResult::NotHandled;
     }
 
     // Compute and store the common info used by both PointerEvent and TouchEvent.
     WillBeHeapVector<TouchInfo> touchInfos(points.size());
 
@@ skipping 153 matching lines @@
 PlatformEvent::Modifiers EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return static_cast<PlatformEvent::Modifiers>(PlatformEvent::CtrlKey | PlatformEvent::AltKey);
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace blink