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/battery/NavigatorBattery.idl b/Source/modules/presentation/NavigatorPresentation.idl
similarity index 54%
copy from Source/modules/battery/NavigatorBattery.idl
copy to Source/modules/presentation/NavigatorPresentation.idl
index c5bff09da1473e835b8de2b1f59997117385b2c6..4cf7e1e3de71c4d96955ed98163dc25c1b05eb33 100644
--- a/Source/modules/battery/NavigatorBattery.idl
+++ b/Source/modules/presentation/NavigatorPresentation.idl
@@ -2,9 +2,10 @@
 // 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=BatteryStatus,
+    RuntimeEnabled=Presentation
 ] partial interface Navigator {
-    [CallWith=ScriptState] Promise getBattery();
+    readonly attribute Presentation presentation;
 };
-