Fix an issue that subtitle is not shown for native fullscreen video that is inside an iframe

Source/core/rendering/compositing/GraphicsLayerUpdater.cpp

 /*
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  * Copyright (C) 2014 Google Inc. All rights reserved.
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 #include "config.h"
 #include "core/rendering/compositing/GraphicsLayerUpdater.h"
 
+#include "core/html/HTMLMediaElement.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderLayerReflectionInfo.h"
 #include "core/rendering/RenderPart.h"
 #include "core/rendering/RenderView.h"
 #include "core/rendering/compositing/CompositedLayerMapping.h"
 #include "core/rendering/compositing/RenderLayerCompositor.h"
 #include "public/platform/Platform.h"
 
 namespace WebCore {
 
+bool shouldAppendLayer(const RenderLayer& layer)
+{
+    if (!RuntimeEnabledFeatures::overlayFullscreenVideoEnabled())
+        return true;
+    Node* node = layer.renderer()->node();
+    if (isHTMLMediaElement(*node) && toHTMLMediaElement(node)->isFullscreen())
+        return false;
+    return true;
+}
+
 GraphicsLayerUpdater::GraphicsLayerUpdater(RenderView& renderView)
     : m_renderView(renderView)
     , m_pixelsWithoutPromotingAllTransitions(0.0)
     , m_pixelsAddedByPromotingAllTransitions(0.0)
 {
 }
 
 GraphicsLayerUpdater::~GraphicsLayerUpdater()
 {
 }
@@ skipping 65 matching lines @@
                 overflowControlLayer->removeFromParent();
                 currentCompositedLayerMapping->parentForSublayers()->addChild(overflowControlLayer);
             }
 
             if (GraphicsLayer* overflowControlLayer = currentCompositedLayerMapping->layerForScrollCorner()) {
                 overflowControlLayer->removeFromParent();
                 currentCompositedLayerMapping->parentForSublayers()->addChild(overflowControlLayer);
             }
         }
 
-        childLayersOfEnclosingLayer.append(currentCompositedLayerMapping->childForSuperlayers());
+        if (shouldAppendLayer(layer))
+            childLayersOfEnclosingLayer.append(currentCompositedLayerMapping->childForSuperlayers());
     }
 
     if (!depth) {
         int percentageIncreaseInPixels = static_cast<int>(m_pixelsAddedByPromotingAllTransitions / m_pixelsWithoutPromotingAllTransitions * 100);
         blink::Platform::current()->histogramCustomCounts("Renderer.PixelIncreaseFromTransitions", percentageIncreaseInPixels, 0, 1000, 50);
     }
 }
 
 // This just updates layer geometry without changing the hierarchy.
 void GraphicsLayerUpdater::updateRecursive(RenderLayer& layer)
@@ skipping 29 matching lines @@
     mapping->updateGraphicsLayerGeometry();
 
     if (!layer.parent())
         layer.compositor()->updateRootLayerPosition();
 
     if (mapping->hasUnpositionedOverflowControlsLayers())
         layer.scrollableArea()->positionOverflowControls();
 }
 
 } // namespace WebCore