Add the Presentation API module and a single event target

Source/modules/presentation/NavigatorPresentation.idl

Index: Source/modules/presentation/NavigatorPresentation.idl
diff --git a/Source/modules/presentation/NavigatorPresentation.idl b/Source/modules/presentation/NavigatorPresentation.idl
new file mode 100644
index 0000000000000000000000000000000000000000..8d309ba51e73e92805efbae5551049d043932d59
--- /dev/null
+++ b/Source/modules/presentation/NavigatorPresentation.idl
@@ -0,0 +1,12 @@
+// Copyright 2014 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.
+
+// http://webscreens.github.io/presentation-api/#presentation-extension-to-navigator
+
+[
+    RuntimeEnabled=Presentation
+]
+partial interface Navigator {
+    readonly attribute Presentation presentation;
+};