Add the Presentation API module and a single event target

Source/modules/presentation/Presentation.idl

Index: Source/modules/presentation/Presentation.idl
diff --git a/Source/modules/quota/StorageInfo.idl b/Source/modules/presentation/Presentation.idl
similarity index 91%
copy from Source/modules/quota/StorageInfo.idl
copy to Source/modules/presentation/Presentation.idl
index 112f4a472efd8fb27b9517619d4fe513efa3cca7..70a401485ec68838ad513921d470f2f83359ddea 100644
--- a/Source/modules/quota/StorageInfo.idl
+++ b/Source/modules/presentation/Presentation.idl
@@ -28,11 +28,12 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+// http://webscreens.github.io/presentation-api/#presentation-interface
+
 [
     GarbageCollected,
     NoInterfaceObject,
-    RuntimeEnabled=QuotaPromise
-] interface StorageInfo {
-    readonly attribute unsigned long long usage;
-    readonly attribute unsigned long long quota;
+] interface Presentation {
+
+  readonly attribute boolean displayAvailable;

[Peter Beverloo, 2014/07/19 10:16:13]

Out of interest, is this really going to be a bool rather than a promise? Fine
in either case, I expect you to know your spec :-).

[mark a. foltz, 2014/07/21 18:24:58]

This isn't part of the CG final report spec.  Is this just a dummy property that
will be replaced later?

[whywhat, 2014/07/23 00:39:26]

We must have an event handler since the device availability might change over
time without the website doing anything. Having a promise for the property then
seems like too much and as Mark mentions below, the property itself is absent
from the current spec, there's just an event handler.

[whywhat, 2014/07/23 00:39:26]

Yep.

 };