Import chrome idl into third_party

third_party/chrome/idl/experimental_media_galleries.idl

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+namespace experimental.mediaGalleries {
+
+  callback AssembleMediaFileCallback =
+      void ([instanceOf=Blob] optional object mediaFile);
+
+  interface Functions {
+    // Create a new MediaFile setting the metadata in the Blob to the supplied
+    // values, overriding any existing metadata in the media file. If user agent
+    // does not recognize the Blob as a supported file format, it will fail.
+    // |mediaFileContents| : the media bytes.
+    // |metadata| : the metadata. TODO(estade): this should be
+    // [instanceOf=Metafile].
+    static void assembleMediaFile(
+        [instanceOf=Blob] object mediaFileContents,
+        object metadata,
+        AssembleMediaFileCallback callback);
+
+    // Get any thumbnails contained in the passed media file. The resulting
+    // directory reader refers to a virtual directory that can not be navigated
+    // to. If there are no thumbnails in the passed file entry, the virtual
+    // directory will have no entries.
+    // TODO(estade): The return type should be Directory. The argument type
+    // should be [instanceOf=FileEntry].
+    [nocompile] static object extractEmbeddedThumbnails(object mediaFile);
+  };
+
+};