Propagate MediaMetadata to Java side

content/browser/media/session/media_session_service_impl.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #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"
 
 namespace content {
 
 MediaSessionServiceImpl::MediaSessionServiceImpl(
     RenderFrameHost* render_frame_host)
     : render_frame_host_(render_frame_host) {}
 
@@ skipping 12 matching lines @@
     const base::Optional<content::MediaMetadata>& metadata) {
   // When receiving a MediaMetadata, the browser process can't trust that it is
   // coming from a known and secure source. It must be processed accordingly.
   if (metadata.has_value() &&
       !MediaMetadataSanitizer::CheckSanity(metadata.value())) {
     render_frame_host_->GetProcess()->ShutdownForBadMessage(
         RenderProcessHost::CrashReportMode::GENERATE_CRASH_DUMP);
     return;
   }
 
-  metadata_ = metadata;
-
-  NOTIMPLEMENTED();
+  WebContentsImpl* contents = static_cast<WebContentsImpl*>(
+      WebContentsImpl::FromRenderFrameHost(render_frame_host_));
+  if (contents)
+    MediaSession::Get(contents)->SetMetadata(metadata);
 }
 
 void MediaSessionServiceImpl::Bind(
     blink::mojom::MediaSessionServiceRequest request) {
   binding_.reset(new mojo::Binding<blink::mojom::MediaSessionService>(
       this, std::move(request)));
 }
 
 }  // namespace content