Roll 50: Copied IDLs, PYTHON scripts from WebKit removed deleted files in WebCore

modules/mediasession/MediaMetadataInit.idl

Index: modules/mediasession/MediaMetadataInit.idl
diff --git a/modules/mediasession/MediaMetadataInit.idl b/modules/mediasession/MediaMetadataInit.idl
new file mode 100644
index 0000000000000000000000000000000000000000..60377cd6552b599a0ab3bddc79a6598c4026e437
--- /dev/null
+++ b/modules/mediasession/MediaMetadataInit.idl
@@ -0,0 +1,11 @@
+// Copyright 2015 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.
+
+// https://mediasession.spec.whatwg.org/#the-mediametadata-interface
+
+dictionary MediaMetadataInit {
+    DOMString title = "";
+    DOMString artist = "";
+    DOMString album = "";
+};