Make the video layer visibility configurable in OverlayFullscreenVideo mode

third_party/WebKit/public/platform/WebMediaPlayer.h

Index: third_party/WebKit/public/platform/WebMediaPlayer.h
diff --git a/third_party/WebKit/public/platform/WebMediaPlayer.h b/third_party/WebKit/public/platform/WebMediaPlayer.h
index 9979e856dae347c8f0d7c1aa103727dd3751640c..826a5db2761c2672d8639c158246ec91940b4ae5 100644
--- a/third_party/WebKit/public/platform/WebMediaPlayer.h
+++ b/third_party/WebKit/public/platform/WebMediaPlayer.h
@@ -105,6 +105,16 @@ public:
     typedef WebString TrackId;
     enum TrackType { TextTrack, AudioTrack, VideoTrack };
 
+    // Overlay fullscreen video can work in these modes. VideoLayerVisible will
+    // leave the contents of the GraphicsLayer associated with the video element
+    // visible, whereas VideoLayerInvisible will hide it so that only the
+    // controls are visible.
+    enum class OverlayFullscreenVideoMode {
+        Disabled,
+        VideoLayerVisible,
+        VideoLayerInvisible,
+    };
+
     virtual ~WebMediaPlayer() { }
 
     virtual void load(LoadType, const WebMediaPlayerSource&, CORSMode) = 0;
@@ -188,11 +198,8 @@ public:
     // Sets the poster image URL.
     virtual void setPoster(const WebURL& poster) { }
 
-    // Whether the WebMediaPlayer supports overlay fullscreen video mode. When
-    // this is true, the video layer will be removed from the layer tree when
-    // entering fullscreen, and the WebMediaPlayer is responsible for displaying
-    // the video in enteredFullscreen().
-    virtual bool supportsOverlayFullscreenVideo() { return false; }
+    // Which OverlayFullscreenVideoMode should be used in fullscren.
+    virtual OverlayFullscreenVideoMode getOverlayFullscreenVideoMode() { return OverlayFullscreenVideoMode::Disabled; }
     // Inform WebMediaPlayer when the element has entered/exited fullscreen.
     virtual void enteredFullscreen() { }
     virtual void exitedFullscreen() { }