Support subtitles for native fullscreen video

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1332 matching lines @@
                 document()->updateFocusAppearanceSoon(false /* don't restore selection */);
             data->setNeedsFocusAppearanceUpdateSoonAfterAttach(false);
         }
     }
 
     // FIXME: It doesn't appear safe to call didRecalculateStyleForElement when
     // not in a Document::recalcStyle. Since we're hopefully going to always
     // lazyAttach in the future that problem should go away.
     if (document()->inStyleRecalc())
         InspectorInstrumentation::didRecalculateStyleForElement(this);
+
+    if (FullscreenElementStack::isActiveFullScreenElement(this)) {
+        if (FrameView* view = document()->view())
+            view->setCurrentFullscreenRenderer(renderer());
+    }
 }
 
 void Element::unregisterNamedFlowContentNode()
 {
     if (RuntimeEnabledFeatures::cssRegionsEnabled() && inNamedFlow() && document()->renderView())
         document()->renderView()->flowThreadController()->unregisterNamedFlowContentNode(this);
 }
 
 void Element::detach(const AttachContext& context)
 {
+    if (FullscreenElementStack::isActiveFullScreenElement(this)) {
+        if (FrameView* view = document()->view())
+            view->setCurrentFullscreenRenderer(0);
+    }
+
     WidgetHierarchyUpdatesSuspensionScope suspendWidgetHierarchyUpdates;
     unregisterNamedFlowContentNode();
     cancelFocusAppearanceUpdate();
     if (hasRareData()) {
         ElementRareData* data = elementRareData();
         data->setPseudoElement(BEFORE, 0);
         data->setPseudoElement(AFTER, 0);
         data->setPseudoElement(BACKDROP, 0);
         data->setIsInCanvasSubtree(false);
         data->resetComputedStyle();
@@ skipping 2271 matching lines @@
     }
     return 0;
 }
 
 Attribute* UniqueElementData::attributeItem(unsigned index)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(index < length());
     return &m_attributeVector.at(index);
 }
 
+void Element::didBecomeFullscreenElement()
+{
+    FrameView* view = document()->view();
+    if (!view)
+        return;
+    view->setCurrentFullscreenRenderer(renderer());
+}
+
+void Element::willStopBeingFullscreenElement()
+{
+    FrameView* view = document()->view();
+    if (!view)
+        return;
+    view->setCurrentFullscreenRenderer(0);
+}
+
 } // namespace WebCore