Support subtitles for native fullscreen video

Source/core/page/FrameView.cpp

Index: Source/core/page/FrameView.cpp
diff --git a/Source/core/page/FrameView.cpp b/Source/core/page/FrameView.cpp
index f3abc4cd22b4ebf71706b6d87a807622c8671a90..50bf979718eb05f536ca0cd4095d8c51955892fa 100644
--- a/Source/core/page/FrameView.cpp
+++ b/Source/core/page/FrameView.cpp
@@ -3393,4 +3393,11 @@ bool FrameView::isMainFrame() const
     return m_frame->page() && m_frame->page()->mainFrame() == m_frame;
 }
 
+void FrameView::setCurrentFullscreenRenderer(RenderObject* renderer)
+{
+    ASSERT(isMainFrame());
+    if (RenderView* renderView = this->renderView())

[esprehn, 2013/09/13 02:46:07]

Going through here if there's no RenderView sounds like a bug, you can
ASSERT(renderView()) if you want, but null checking it doesn't look right.

[trchen, 2013/09/13 05:14:58]

This can happen during frame destruction. RenderView get detached before
everything else.

+        renderView->compositor()->setCurrentFullscreenRenderer(renderer);
+}
+
 } // namespace WebCore