update image size responses

MediaBrowser.Api/Images/ImageService.cs

@@ -326,7 +326,7 @@ namespace MediaBrowser.Api.Images
                         var fileInfo = _fileSystem.GetFileInfo(info.Path);
                         length = fileInfo.Length;
 
-                        var size = _imageProcessor.GetImageSize(info);
+                        var size = _imageProcessor.GetImageSize(info, true);
 
                         width = Convert.ToInt32(size.Width);
                         height = Convert.ToInt32(size.Height);

MediaBrowser.Controller/Drawing/IImageProcessor.cs

@@ -33,6 +33,8 @@ namespace MediaBrowser.Controller.Drawing
         /// <returns>ImageSize.</returns>
         ImageSize GetImageSize(ItemImageInfo info);
 
+        ImageSize GetImageSize(ItemImageInfo info, bool allowSlowMethods);
+
         /// <summary>
         /// Gets the size of the image.
         /// </summary>