Add a flag to update hover effect when a layout is changed

third_party/WebKit/Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
@@ skipping 2071 matching lines @@
   // SecurityOrigin.
 
   UpdateStyle();
 
   NotifyLayoutTreeOfSubtreeChanges();
 
   // As a result of the style recalculation, the currently hovered element might
   // have been detached (for example, by setting display:none in the :hover
   // style), schedule another mouseMove event to check if any other elements
   // ended up under the mouse pointer due to re-layout.
-  if (HoverElement() && !HoverElement()->GetLayoutObject() && GetFrame())
-    GetFrame()->GetEventHandler().DispatchFakeMouseMoveEventSoon();
+  if (HoverElement() && !HoverElement()->GetLayoutObject() && GetFrame()) {
+    GetFrame()->GetEventHandler().DispatchFakeMouseMoveEventSoon(
+        MouseEventManager::FakeMouseMoveReason::kPerFrame);
+  }
 
   if (focused_element_ && !focused_element_->IsFocusable())
     ClearFocusedElementSoon();
   GetLayoutViewItem().ClearHitTestCache();
 
   DCHECK(!DocumentAnimations::NeedsAnimationTimingUpdate(*this));
 
   unsigned element_count =
       GetStyleEngine().StyleForElementCount() - start_element_count;
 
@@ skipping 4825 matching lines @@
 }
 
 void showLiveDocumentInstances() {
   WeakDocumentSet& set = liveDocumentSet();
   fprintf(stderr, "There are %u documents currently alive:\n", set.size());
   for (blink::Document* document : set)
     fprintf(stderr, "- Document %p URL: %s\n", document,
             document->Url().GetString().Utf8().data());
 }
 #endif