Media Session API: make MediaMetadata mutable.

third_party/WebKit/Source/modules/mediasession/MediaMetadata.cpp

 // Copyright 2015 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 "modules/mediasession/MediaMetadata.h"
 
 #include "core/dom/ExecutionContext.h"
 #include "modules/mediasession/MediaImage.h"
 #include "modules/mediasession/MediaMetadataInit.h"
+#include "modules/mediasession/MediaSession.h"
 
 namespace blink {
 
 // static
 MediaMetadata* MediaMetadata::create(ExecutionContext* context,
                                      const MediaMetadataInit& metadata) {
   return new MediaMetadata(context, metadata);
 }
 
 MediaMetadata::MediaMetadata(ExecutionContext* context,
-                             const MediaMetadataInit& metadata) {
+                             const MediaMetadataInit& metadata)
+    : m_notifySessionTimer(this, &MediaMetadata::notifySessionTimerFired) {
   m_title = metadata.title();
   m_artist = metadata.artist();
   m_album = metadata.album();
   for (const auto& image : metadata.artwork())
     m_artwork.append(MediaImage::create(context, image));
 }
 
 String MediaMetadata::title() const {
   return m_title;
 }
 
 String MediaMetadata::artist() const {
   return m_artist;
 }
 
 String MediaMetadata::album() const {
   return m_album;
 }
 
 const HeapVector<Member<MediaImage>>& MediaMetadata::artwork() const {
   return m_artwork;
 }
 
+void MediaMetadata::setTitle(const String& title) {
+  m_title = title;
+  notifySessionAsync();
+}
+
+void MediaMetadata::setArtist(const String& artist) {
+  m_artist = artist;
+  notifySessionAsync();
+}
+
+void MediaMetadata::setAlbum(const String& album) {
+  m_album = album;
+  notifySessionAsync();
+}
+
+void MediaMetadata::setArtwork(const HeapVector<Member<MediaImage>>& artwork) {
+  m_artwork = artwork;
+  notifySessionAsync();
+}
+
+void MediaMetadata::setSession(MediaSession* session) {
+  m_session = session;
+}
+
+void MediaMetadata::notifySessionAsync() {
+  if (!m_session || m_notifySessionTimer.isActive())
+    return;
+  m_notifySessionTimer.startOneShot(0, BLINK_FROM_HERE);
+}
+
+void MediaMetadata::notifySessionTimerFired(TimerBase*) {
+  if (!m_session)
+    return;
+  m_session->onMetadataChanged();
+}
+
 DEFINE_TRACE(MediaMetadata) {
   visitor->trace(m_artwork);
+  visitor->trace(m_session);
 }
 
 }  // namespace blink