Implement PermissionDescriptor usage in Permissions API.

Source/modules/permissions/Permissions.idl

Index: Source/modules/permissions/Permissions.idl
diff --git a/Source/modules/permissions/Permissions.idl b/Source/modules/permissions/Permissions.idl
index 736c86efe369106c918c8865a068c0b431a7f5ed..89f7dfd085feaf198c4d532d4c1d92001f12a072 100644
--- a/Source/modules/permissions/Permissions.idl
+++ b/Source/modules/permissions/Permissions.idl
@@ -5,17 +5,10 @@
 // Specification at:
 // https://w3c.github.io/permissions/
 
-enum PermissionName {
-    "geolocation",
-    "notifications",
-    "push-notifications",
-    "midi-sysex"
-};
-
 [
     Exposed=(Window,Worker),
     GarbageCollected,
     RuntimeEnabled=Permissions
 ] interface Permissions {
-    [CallWith=ScriptState] Promise<PermissionStatus> query(PermissionName permission);
+    [CallWith=ScriptState] Promise<PermissionStatus> query(object permission);

[whywhat, 2015/03/31 14:51:45]

won't PermissionDescriptor work here?

[mlamouri (slow - plz ping), 2015/03/31 20:24:47]

Yes and no. It would be we couldn't re-parse it to a specialized value because
we wouldn't get the v8 value.

 };