Files.app: Add new metadata properties that are needed for ImageEncoder.

ui/file_manager/file_manager/foreground/js/metadata/metadata_item.js

Index: ui/file_manager/file_manager/foreground/js/metadata/metadata_item.js
diff --git a/ui/file_manager/file_manager/foreground/js/metadata/metadata_item.js b/ui/file_manager/file_manager/foreground/js/metadata/metadata_item.js
index 447ce56cd66f80eb8a91be08f2de94f001ba459d..6bd166443e8857c882fcc1a415989b4cc2e48959 100644
--- a/ui/file_manager/file_manager/foreground/js/metadata/metadata_item.js
+++ b/ui/file_manager/file_manager/foreground/js/metadata/metadata_item.js
@@ -138,4 +138,22 @@ function MetadataItem() {
    * @public {string|undefined}
    */
   this.mediaArtist;
+
+  /**
+   * Mime type obtained by content provider based on URL.
+   * TODO(hirono): Remove the mediaMimeType.
+   * @public {string|undefined}
+   */
+  this.mediaMimeType;
+
+  /**
+   * "Image File Directory" obtained from EXIF header.
+   * @public {!Object|undefined}
+   */
+  this.ifd;
+
+  /**
+   * @public {boolean|undefined}
+   */
+  this.exifLittleEndian;
 }