Make the video layer visibility configurable in OverlayFullscreenVideo mode

third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp

Index: third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
diff --git a/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp b/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
index 315a6b0d177230d594ac511d8c574eebd7a2f1c5..6178e264b40f1d4748201860a399846a0d2906dd 100644
--- a/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
+++ b/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
@@ -36,6 +36,7 @@
 #include "core/html/HTMLCanvasElement.h"
 #include "core/html/HTMLIFrameElement.h"
 #include "core/html/HTMLMediaElement.h"
+#include "core/html/HTMLVideoElement.h"
 #include "core/html/canvas/CanvasRenderingContext.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/layout/LayoutEmbeddedObject.h"
@@ -799,7 +800,11 @@ void CompositedLayerMapping::updateMainGraphicsLayerGeometry(const IntRect& rela
     // descendants. So, the visibility flag for m_graphicsLayer should be true if there are any
     // non-compositing visible layers.
     bool contentsVisible = m_owningLayer.hasVisibleContent() || hasVisibleNonCompositingDescendant(&m_owningLayer);
-
+    if (layoutObject()->isVideo()) {
+        HTMLVideoElement* videoElement = toHTMLVideoElement(layoutObject()->node());
+        if (videoElement->isFullscreen() && videoElement->overlayFullscreenVideoMode() == WebMediaPlayer::OverlayFullscreenVideoMode::VideoLayerInvisible)
+            contentsVisible = false;
+    }
     m_graphicsLayer->setContentsVisible(contentsVisible);
 
     m_graphicsLayer->setBackfaceVisibility(layoutObject()->style()->backfaceVisibility() == BackfaceVisibilityVisible);