Delegate dragend to the correct frame's EventHandler.

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

Index: third_party/WebKit/Source/core/input/EventHandler.cpp
diff --git a/third_party/WebKit/Source/core/input/EventHandler.cpp b/third_party/WebKit/Source/core/input/EventHandler.cpp
index a40a5bc065dff8cd721b95a119fcf4bc36e0dad3..f86d76dd2853df7dbce02456d9d7ca79fc84f896 100644
--- a/third_party/WebKit/Source/core/input/EventHandler.cpp
+++ b/third_party/WebKit/Source/core/input/EventHandler.cpp
@@ -1967,7 +1967,19 @@ void EventHandler::defaultKeyboardEventHandler(KeyboardEvent* event) {
 
 void EventHandler::dragSourceEndedAt(const PlatformMouseEvent& event,
                                      DragOperation operation) {
-  m_mouseEventManager->dragSourceEndedAt(event, operation);
+  // Asides from routing the event to the correct frame, the hit test is also an
+  // opportunity for Layer to update the :hover and :active pseudoclasses.
+  HitTestRequest request(HitTestRequest::Release);
+  MouseEventWithHitTestResults mev =
+      EventHandlingUtil::performMouseEventHitTest(m_frame, request, event);
+
+  LocalFrame* targetFrame;
+  if (targetIsFrame(mev.innerNode(), targetFrame)) {
+    if (targetFrame)
+      targetFrame->eventHandler().dragSourceEndedAt(event, operation);
+  } else {
+    m_mouseEventManager->dragSourceEndedAt(event, operation);
+  }
 }
 
 void EventHandler::updateDragStateAfterEditDragIfNeeded(