Support subtitles for native fullscreen video

Source/core/rendering/RenderLayerBacking.cpp

Index: Source/core/rendering/RenderLayerBacking.cpp
diff --git a/Source/core/rendering/RenderLayerBacking.cpp b/Source/core/rendering/RenderLayerBacking.cpp
index 938cf70beb81d0779674b2ebd2e68fca14c16284..def326bdcc13fd8600d3d32b2c33b048aeb3f09a 100644
--- a/Source/core/rendering/RenderLayerBacking.cpp
+++ b/Source/core/rendering/RenderLayerBacking.cpp
@@ -512,7 +512,15 @@ void RenderLayerBacking::updateGraphicsLayerGeometry()
     // m_graphicsLayer is the corresponding GraphicsLayer for this RenderLayer and its non-compositing
     // descendants. So, the visibility flag for m_graphicsLayer should be true if there are any
     // non-compositing visible layers.
-    m_graphicsLayer->setContentsVisible(m_owningLayer->hasVisibleContent() || hasVisibleNonCompositingDescendantLayers());
+    bool contentsVisible = m_owningLayer->hasVisibleContent() || hasVisibleNonCompositingDescendantLayers();
+#if USE(NATIVE_FULLSCREEN_VIDEO)
+    if (renderer()->isVideo()) {
+        HTMLMediaElement* mediaElement = toMediaElement(renderer()->node());
+        if (mediaElement->isFullscreen())
+            contentsVisible = false;
+    }
+#endif
+    m_graphicsLayer->setContentsVisible(contentsVisible);
 
     RenderStyle* style = renderer()->style();
     // FIXME: reflections should force transform-style to be flat in the style: https://bugs.webkit.org/show_bug.cgi?id=106959