Propagate MediaMetadata to Java side

content/browser/media/session/media_session_service_impl.cc

Index: content/browser/media/session/media_session_service_impl.cc
diff --git a/content/browser/media/session/media_session_service_impl.cc b/content/browser/media/session/media_session_service_impl.cc
index c4dd89961cabaef82ffcb6e54acf274111529067..c7dbf721bc17a8ad660509ce61968e3bcfe07887 100644
--- a/content/browser/media/session/media_session_service_impl.cc
+++ b/content/browser/media/session/media_session_service_impl.cc
@@ -5,6 +5,7 @@
 #include "content/browser/media/session/media_session_service_impl.h"
 
 #include "content/browser/media/session/media_metadata_sanitizer.h"
+#include "content/browser/media/session/media_session.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/web_contents.h"
@@ -37,9 +38,10 @@ void MediaSessionServiceImpl::SetMetadata(
     return;
   }
 
-  metadata_ = metadata;
-
-  NOTIMPLEMENTED();
+  WebContentsImpl* contents = static_cast<WebContentsImpl*>(
+      WebContentsImpl::FromRenderFrameHost(render_frame_host_));
+  if (contents)
+    MediaSession::Get(contents)->SetMetadata(metadata);
 }
 
 void MediaSessionServiceImpl::Bind(