Implement MediaMetadata artwork in Blink

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

Index: third_party/WebKit/Source/modules/mediasession/MediaMetadata.h
diff --git a/third_party/WebKit/Source/modules/mediasession/MediaMetadata.h b/third_party/WebKit/Source/modules/mediasession/MediaMetadata.h
index dcdc2c106f21b1e07834d6416d7de654c23c22a1..af70d0a698ededc8b2f23f6ed66e47cb373d369e 100644
--- a/third_party/WebKit/Source/modules/mediasession/MediaMetadata.h
+++ b/third_party/WebKit/Source/modules/mediasession/MediaMetadata.h
@@ -12,6 +12,8 @@
 
 namespace blink {
 
+class ExecutionContext;
+class MediaArtwork;
 class MediaMetadataInit;
 
 // Implementation of MediaMetadata interface from the Media Session API.
@@ -20,20 +22,22 @@ class MODULES_EXPORT MediaMetadata final
     , public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static MediaMetadata* create(const MediaMetadataInit&);
+    static MediaMetadata* create(ExecutionContext*, const MediaMetadataInit&);
 
     String title() const;
     String artist() const;
     String album() const;
+    HeapVector<Member<MediaArtwork>> artworks() const;
 
     WebMediaMetadata* data() { return &m_data; }
 
     DEFINE_INLINE_TRACE() { }
 
 private:
-    MediaMetadata(const MediaMetadataInit&);
+    MediaMetadata(ExecutionContext*, const MediaMetadataInit&);
 
     WebMediaMetadata m_data;
+    HeapVector<Member<MediaArtwork>> m_artworks;
 };
 
 } // namespace blink