Forward mouse down node information to WebWidgetClient

Source/core/input/EventHandler.cpp

Index: Source/core/input/EventHandler.cpp
diff --git a/Source/core/input/EventHandler.cpp b/Source/core/input/EventHandler.cpp
index 19698b6bf5a0b587896378adc6a5058273c8515d..e1f1fd7feb716017e190974ca5ba877e71635c0b 100644
--- a/Source/core/input/EventHandler.cpp
+++ b/Source/core/input/EventHandler.cpp
@@ -998,6 +998,13 @@ bool EventHandler::handleMousePressEvent(const PlatformMouseEvent& mouseEvent)
             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;
 }
 
@@ -2074,6 +2081,14 @@ bool EventHandler::handleGestureTap(const GestureEventWithHitTestResults& target
         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;
 }