include: Add Windows.Gaming.Input.IGamepad2 interface declaration.

Author: rbernon

include/windows.gaming.input.idl

@@ -446,6 +446,19 @@ namespace Windows.Gaming.Input {
         HRESULT GetCurrentReading([out, retval] Windows.Gaming.Input.GamepadReading *value);
     }
 
+    [
+        contract(Windows.Foundation.UniversalApiContract, 3.0),
+        exclusiveto(Windows.Gaming.Input.Gamepad),
+        uuid(3c1689bd-5915-4245-b0c0-c89fae0308ff)
+    ]
+    interface IGamepad2 : IInspectable
+        requires Windows.Gaming.Input.IGamepad,
+                 Windows.Gaming.Input.IGameController
+    {
+        HRESULT GetButtonLabel([in] Windows.Gaming.Input.GamepadButtons button,
+                               [out, retval] Windows.Gaming.Input.GameControllerButtonLabel *value);
+    }
+
     [
         contract(Windows.Foundation.UniversalApiContract, 3.0),
         exclusiveto(Windows.Gaming.Input.RacingWheel),