Split MediaSessionStateChanged() and MediaSessionMetadataChanged()

content/browser/media/session/media_session.cc

Index: content/browser/media/session/media_session.cc
diff --git a/content/browser/media/session/media_session.cc b/content/browser/media/session/media_session.cc
index 147b3379af0216820b7ef4bd29844fb71eb3f5bc..aa165b9bf0aad3f374ac31973b7138b5844eb515 100644
--- a/content/browser/media/session/media_session.cc
+++ b/content/browser/media/session/media_session.cc
@@ -75,10 +75,8 @@ void MediaSession::WebContentsDestroyed() {
 
 void MediaSession::SetMetadata(const base::Optional<MediaMetadata>& metadata) {
   metadata_ = metadata;
-  // TODO(zqzhang): On Android, the metadata is sent though JNI everytime the
-  // media session play/pause state changes. Need to find a way to seprate the
-  // state change and Metadata update. See https://crbug.com/621855.
-  static_cast<WebContentsImpl*>(web_contents())->OnMediaSessionStateChanged();
+  static_cast<WebContentsImpl*>(web_contents())
+      ->OnMediaSessionMetadataChanged();
 }
 
 bool MediaSession::AddPlayer(MediaSessionObserver* observer,