Add the Presentation API module and a single event target

Source/modules/presentation/Presentation.idl

+// 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-interface
+
+[
+    GarbageCollected,

[Peter Beverloo, 2014/07/25 18:01:18]

Should this be an interface object?

[whywhat, 2014/08/19 18:07:35]

It is an interface? What do you mean?

+    RuntimeEnabled=Presentation
+] interface Presentation : EventTarget {
+  readonly attribute boolean displayAvailable;
+  attribute EventHandler onavailablechange;
+};