Monitor the intersection of video and viewport.

media/blink/webmediaplayer_impl.cc

Index: media/blink/webmediaplayer_impl.cc
diff --git a/media/blink/webmediaplayer_impl.cc b/media/blink/webmediaplayer_impl.cc
index 3e1500e121bab874f209093e74cb36922672fd20..68788d6409b1f58a580ba7165444bf4dde896aad 100644
--- a/media/blink/webmediaplayer_impl.cc
+++ b/media/blink/webmediaplayer_impl.cc
@@ -352,6 +352,15 @@ void WebMediaPlayerImpl::exitedFullscreen() {
     observer_->OnExitedFullscreen();
 }
 
+void WebMediaPlayerImpl::videoViewportIntersectionChanged(
+    const blink::WebMediaPlayer::ViewportIntersectionInfo& info) {
+  MediaObserver::ViewportIntersectionInfo intersect_info;
+  intersect_info.root_rect = info.rootRect;
+  intersect_info.intersect_rect = info.intersectRect;
+  if (observer_)
+    observer_->OnVideoViewportIntersectionChanged(intersect_info);
+}
+
 void WebMediaPlayerImpl::DoLoad(LoadType load_type,
                                 const blink::WebURL& url,
                                 CORSMode cors_mode) {