Forward mouse down node information to WebWidgetClient

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 980 matching lines @@
             HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active);
             mev = m_frame->document()->prepareMouseEvent(request, documentPoint, mouseEvent);
         }
 
         if (passMousePressEventToScrollbar(mev))
             swallowEvent = true;
         else
             swallowEvent = handleMousePressEvent(mev);
     }
 
+    if (mev.hitTestResult().innerNode() && mouseEvent.button() == LeftButton) {
+        ASSERT(mouseEvent.type() == PlatformEvent::MousePressed);
+        HitTestResult result = mev.hitTestResult();
+        result.setToShadowHostIfInUserAgentShadowRoot();
+        m_frame->chromeClient().onClickInput(result.innerNode());
+    }
+
     return swallowEvent;
 }
 
 static DeprecatedPaintLayer* layerForNode(Node* node)
 {
     if (!node)
         return nullptr;
 
     LayoutObject* layoutObject = node->layoutObject();
     if (!layoutObject)
@@ skipping 1056 matching lines @@
         swallowMouseUpEvent = handleMouseReleaseEvent(MouseEventWithHitTestResults(fakeMouseUp, currentHitTest));
 
     bool swallowed = swallowMouseDownEvent | swallowMouseUpEvent | swallowClickEvent;
     if (!swallowed && tappedNode && m_frame->page()) {
         bool domTreeChanged = preDispatchDomTreeVersion != m_frame->document()->domTreeVersion();
         bool styleChanged = preDispatchStyleVersion != m_frame->document()->styleVersion();
 
         IntPoint tappedPositionInViewport = m_frame->page()->frameHost().pinchViewport().rootFrameToViewport(tappedPosition);
         m_frame->chromeClient().showUnhandledTapUIIfNeeded(tappedPositionInViewport, tappedNode.get(), domTreeChanged || styleChanged);
     }
+
+    if (currentHitTest.innerNode()) {

[Rick Byers, 2015/06/18 17:02:10]

If we're going to invoke this after mousedown for mouse input, I think we should
do the same for tap for consistency.  Eg. a page that changes the dom on mouseup
events should behave the same wrt. this callback whether or not the input is
touch of mouse.

[Yufeng Shen (Slow to review), 2015/06/18 18:29:03]

done.

Moved the onMouseDown() up to right after handleMousePressEvent() is called.

We fire onMouseDown() regardless of the disposition of the dispatching, which
is to match the current expectation of PageClickTracker. But if in the future
we decide that we only fire onMouseDown if the mouse down is not prevent
default,
we can then merge the onMouseDown for tap/mouse into one place in
handleMousePressEvent().

+        ASSERT(gestureEvent.type() == PlatformEvent::GestureTap);
+        HitTestResult result = currentHitTest;
+        result.setToShadowHostIfInUserAgentShadowRoot();
+        m_frame->chromeClient().onClickInput(result.innerNode());
+    }
+
     return swallowed;
 }
 
 bool EventHandler::handleGestureLongPress(const GestureEventWithHitTestResults& targetedEvent)
 {
     const PlatformGestureEvent& gestureEvent = targetedEvent.event();
     IntPoint adjustedPoint = gestureEvent.position();
 
     unsigned modifiers = gestureEvent.modifiers();
 
@@ skipping 1674 matching lines @@
 unsigned EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace blink