Register the overlay view as non-obstructing

Currently IMA determines that the overlay is obstructing, even
if it's empty. Register it as friendly, which means we're
assuming that anything the apps puts in it is necessary for
playback.

PiperOrigin-RevId: 234963065

library/ui/src/main/java/com/google/android/exoplayer2/ui/PlayerView.java

@@ -70,6 +70,7 @@
 import java.lang.annotation.Documented;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -1117,7 +1118,14 @@ public ViewGroup getAdViewGroup() {
 
   @Override
   public View[] getAdOverlayViews() {
-    return controller != null ? new View[] {controller} : new View[0];
+    ArrayList<View> overlayViews = new ArrayList<>();
+    if (overlayFrameLayout != null) {
+      overlayViews.add(overlayFrameLayout);
+    }
+    if (controller != null) {
+      overlayViews.add(controller);
+    }
+    return overlayViews.toArray(new View[0]);
   }
 
   // Internal methods.