call metadata savers after items are updated

MediaBrowser.Providers/MediaBrowser.Providers.csproj

@@ -76,6 +76,7 @@
     <Compile Include="Music\LastfmHelper.cs" />
     <Compile Include="Music\MusicArtistProviderFromJson.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Savers\MovieXmlSaver.cs" />
     <Compile Include="TV\EpisodeImageFromMediaLocationProvider.cs" />
     <Compile Include="TV\EpisodeProviderFromXml.cs" />
     <Compile Include="TV\EpisodeXmlParser.cs" />

MediaBrowser.Providers/Savers/MovieXmlSaver.cs

@@ -0,0 +1,49 @@
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Entities.Movies;
+using MediaBrowser.Controller.Library;
+using MediaBrowser.Model.Entities;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Providers.Savers
+{
+    /// <summary>
+    /// Saves movie.xml for movies, trailers and music videos
+    /// </summary>
+    public class MovieXmlSaver : IMetadataSaver
+    {
+        /// <summary>
+        /// Supportses the specified item.
+        /// </summary>
+        /// <param name="item">The item.</param>
+        /// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
+        public bool Supports(BaseItem item)
+        {
+            if (item.LocationType != LocationType.FileSystem)
+            {
+                return false;
+            }
+
+            var trailer = item as Trailer;
+
+            if (trailer != null)
+            {
+                return !trailer.IsLocalTrailer;
+            }
+
+            // Don't support local trailers
+            return item is Movie || item is MusicVideo;
+        }
+
+        /// <summary>
+        /// Saves the specified item.
+        /// </summary>
+        /// <param name="item">The item.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task.</returns>
+        public Task Save(BaseItem item, CancellationToken cancellationToken)
+        {
+            return Task.Run(() => { });
+        }
+    }
+}