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..b130bc061af6c82b071fda464e8c6e48f032897e 100644
--- a/third_party/WebKit/Source/core/input/EventHandler.cpp
+++ b/third_party/WebKit/Source/core/input/EventHandler.cpp
@@ -1967,6 +1967,20 @@ void EventHandler::defaultKeyboardEventHandler(KeyboardEvent* event) {
 
 void EventHandler::dragSourceEndedAt(const PlatformMouseEvent& event,
                                      DragOperation 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);
+      return;
+    }
+  }
+
   m_mouseEventManager->dragSourceEndedAt(event, operation);
 }