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

modules/mediasession/MediaMetadata.idl

Index: modules/mediasession/MediaMetadata.idl
diff --git a/modules/mediasession/MediaMetadata.idl b/modules/mediasession/MediaMetadata.idl
new file mode 100644
index 0000000000000000000000000000000000000000..03f0d45f0fcd0c2b0b1e9e873e40bf5b0b55cffd
--- /dev/null
+++ b/modules/mediasession/MediaMetadata.idl
@@ -0,0 +1,15 @@
+// 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
+
+[
+    Constructor(MediaMetadataInit metadata),
+    GarbageCollected,
+    RuntimeEnabled=MediaSession,
+] interface MediaMetadata {
+    readonly attribute DOMString title;
+    readonly attribute DOMString artist;
+    readonly attribute DOMString album;
+};