Media Session API: make MediaMetadata mutable.

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

Index: third_party/WebKit/Source/modules/mediasession/MediaMetadata.cpp
diff --git a/third_party/WebKit/Source/modules/mediasession/MediaMetadata.cpp b/third_party/WebKit/Source/modules/mediasession/MediaMetadata.cpp
index 3915d544a905fd5a5d69bfcdb07da07f3e00c6c8..a3b93e1c3c2ce2c85782cb27ec1e0b50e8c7d27a 100644
--- a/third_party/WebKit/Source/modules/mediasession/MediaMetadata.cpp
+++ b/third_party/WebKit/Source/modules/mediasession/MediaMetadata.cpp
@@ -7,6 +7,7 @@
 #include "core/dom/ExecutionContext.h"
 #include "modules/mediasession/MediaImage.h"
 #include "modules/mediasession/MediaMetadataInit.h"
+#include "modules/mediasession/MediaSession.h"
 
 namespace blink {
 
@@ -17,7 +18,8 @@ MediaMetadata* MediaMetadata::create(ExecutionContext* context,
 }
 
 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();
@@ -41,8 +43,45 @@ 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