Call SelectionController().sendContextMenuEvent() with up-to-date layout tree

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 9c493509de23239b2fe56dfc1b07e9e7ef45db2b..aa5e6a99cdd499d0c5e903e1880f5bc8f7756fed 100644
--- a/third_party/WebKit/Source/core/input/EventHandler.cpp
+++ b/third_party/WebKit/Source/core/input/EventHandler.cpp
@@ -2039,6 +2039,10 @@ WebInputEventResult EventHandler::sendContextMenuEvent(const PlatformMouseEvent&
     LayoutPoint positionInContents = v->rootFrameToContents(event.position());
     HitTestRequest request(HitTestRequest::Active);
     MouseEventWithHitTestResults mev = m_frame->document()->prepareMouseEvent(request, positionInContents, event);
+    // Since |Document::prepareMouseEvent()| modifies layout tree for setting
+    // hover element, we need to update layout tree for requirement of
+    // |SelectionController::sendContextMenuEvent()|.
+    m_frame->document()->updateStyleAndLayoutIgnorePendingStylesheets();
 
     selectionController().sendContextMenuEvent(mev, positionInContents);