Don't make :hover sticky on tap on sites that set a mobile viewport set

Source/core/page/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 2647 matching lines @@
     switch (type) {
     case PlatformEvent::GestureShowPress:
     case PlatformEvent::GestureTapUnconfirmed:
         return hitType | HitTestRequest::Active;
     case PlatformEvent::GestureTapDownCancel:
         // A TapDownCancel received when no element is active shouldn't really be changing hover state.
         if (!m_frame->document()->activeHoverElement())
             hitType |= HitTestRequest::ReadOnly;
         return hitType | HitTestRequest::Release;
     case PlatformEvent::GestureTap:
-        return hitType | HitTestRequest::Release;
+        hitType |= HitTestRequest::Release;
+        // needs to clear hover on mobile optimized pages
+        if (m_frame->page()->shouldDisableDesktopWorkarounds())
+            hitType |= HitTestRequest::Leave;
+        return hitType;
     case PlatformEvent::GestureTapDown:
     case PlatformEvent::GestureLongPress:
     case PlatformEvent::GestureLongTap:
     case PlatformEvent::GestureTwoFingerTap:
         // FIXME: Shouldn't LongTap and TwoFingerTap clear the Active state?
         return hitType | HitTestRequest::Active | HitTestRequest::ReadOnly;
     default:
         ASSERT_NOT_REACHED();
         return hitType | HitTestRequest::Active | HitTestRequest::ReadOnly;
     }
@@ skipping 274 matching lines @@
 
 void EventHandler::activeIntervalTimerFired(Timer<EventHandler>*)
 {
     m_activeIntervalTimer.stop();
 
     if (m_frame
         && m_frame->document()
         && m_lastDeferredTapElement) {
         // FIXME: Enable condition when http://crbug.com/226842 lands
         // m_lastDeferredTapElement.get() == m_frame->document()->activeElement()
-        HitTestRequest request(HitTestRequest::TouchEvent | HitTestRequest::Release);
+
+        HitTestRequest::HitTestRequestType hitType = HitTestRequest::TouchEvent | HitTestRequest::Release;
+        // This is delayed updating of hover/active states for GestureTap.
+        // So, this needs to clear hover on mobile optimized pages
+        if (m_frame->page()->shouldDisableDesktopWorkarounds())
+            hitType |= HitTestRequest::Leave;
+
+        HitTestRequest request(hitType);
         m_frame->document()->updateHoverActiveState(request, m_lastDeferredTapElement.get());
     }
     m_lastDeferredTapElement = nullptr;
 }
 
 void EventHandler::notifyElementActivated()
 {
     // Since another element has been set to active, stop current timer and clear reference.
     if (m_activeIntervalTimer.isActive())
         m_activeIntervalTimer.stop();
@@ skipping 897 matching lines @@
 unsigned EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace blink