Add WebKit API for doing a hit-test that mimics GestureTap

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 2565 matching lines @@
     } else if (gestureEvent.type() == PlatformEvent::GestureTap) {
         // If the Tap is received very shortly after ShowPress, we want to
         // delay clearing of the active state so that it's visible to the user
         // for at least a couple of frames.
         activeInterval = WTF::currentTime() - m_lastShowPressTimestamp;
         shouldKeepActiveForMinInterval = m_lastShowPressTimestamp && activeInterval < minimumActiveInterval;
         if (shouldKeepActiveForMinInterval)
             hitType |= HitTestRequest::ReadOnly;
     }
 
+    GestureEventWithHitTestResults eventWithHitTestResults = hitTestResultForGestureEvent(gestureEvent, hitType);
+    // Now apply hover/active state to the final target.
+    // FIXME: This is supposed to send mouseenter/mouseleave events, but doesn't because we
+    // aren't passing a PlatformMouseEvent.
+    HitTestRequest request(hitType | HitTestRequest::AllowChildFrameContent);
+    if (!request.readOnly())
+        m_frame->document()->updateHoverActiveState(request, eventWithHitTestResults.hitTestResult().innerElement());
+
+    if (shouldKeepActiveForMinInterval) {
+        m_lastDeferredTapElement = eventWithHitTestResults.hitTestResult().innerElement();
+        m_activeIntervalTimer.startOneShot(minimumActiveInterval - activeInterval, FROM_HERE);
+    }
+
+    return eventWithHitTestResults;
+}
+
+GestureEventWithHitTestResults EventHandler::hitTestResultForGestureEvent(const PlatformGestureEvent& gestureEvent, HitTestRequest::HitTestRequestType hitType)
+{
     // Perform the rect-based hit-test (or point-based if adjustment is disabled). Note that
     // we don't yet apply hover/active state here because we need to resolve touch adjustment
     // first so that we apply hover/active it to the final adjusted node.
     IntPoint hitTestPoint = m_frame->view()->windowToContents(gestureEvent.position());
     LayoutSize padding;
     if (shouldApplyTouchAdjustment(gestureEvent)) {
         padding = gestureEvent.area();
         padding.scale(1.f / 2);
     }
     HitTestResult hitTestResult = hitTestResultAtPoint(hitTestPoint, hitType | HitTestRequest::ReadOnly, padding);
@@ skipping 11 matching lines @@
         LocalFrame* hitFrame = hitTestResult.innerNodeFrame();
         if (!hitFrame)
             hitFrame = m_frame;
         hitTestResult = hitTestResultInFrame(hitFrame, hitFrame->view()->windowToContents(adjustedEvent.position()), hitType | HitTestRequest::ReadOnly);
     }
 
     // If we did a rect-based hit test it must be resolved to the best single node by now to
     // ensure consumers don't accidentally use one of the other candidates.
     ASSERT(!hitTestResult.isRectBasedTest());
 
-    // Now apply hover/active state to the final target.
-    // FIXME: This is supposed to send mouseenter/mouseleave events, but doesn't because we
-    // aren't passing a PlatformMouseEvent.
-    HitTestRequest request(hitType | HitTestRequest::AllowChildFrameContent);
-    if (!request.readOnly())
-        m_frame->document()->updateHoverActiveState(request, hitTestResult.innerElement());
-
-    if (shouldKeepActiveForMinInterval) {
-        m_lastDeferredTapElement = hitTestResult.innerElement();
-        m_activeIntervalTimer.startOneShot(minimumActiveInterval - activeInterval, FROM_HERE);
-    }
-
     return GestureEventWithHitTestResults(adjustedEvent, hitTestResult);
 }
 
 HitTestRequest::HitTestRequestType EventHandler::getHitTypeForGestureType(PlatformEvent::Type type)
 {
     HitTestRequest::HitTestRequestType hitType = HitTestRequest::TouchEvent;
     switch (type) {
     case PlatformEvent::GestureShowPress:
     case PlatformEvent::GestureTapUnconfirmed:
         return hitType | HitTestRequest::Active;
@@ skipping 1240 matching lines @@
 unsigned EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace blink