include: Add Windows.Gaming.Input.ForceFeedback.IForceFeedbackEffect interface declaration.

include/windows.gaming.input.forcefeedback.idl

@@ -28,6 +28,7 @@ import "windows.foundation.idl";
 
 namespace Windows.Gaming.Input.ForceFeedback {
     typedef enum ForceFeedbackEffectAxes ForceFeedbackEffectAxes;
+    typedef enum ForceFeedbackEffectState ForceFeedbackEffectState;
     typedef enum ForceFeedbackLoadEffectResult ForceFeedbackLoadEffectResult;
     interface IForceFeedbackEffect;
     runtimeclass ForceFeedbackMotor;
@@ -51,6 +52,15 @@ namespace Windows.Gaming.Input.ForceFeedback {
     };
 
     [contract(Windows.Foundation.UniversalApiContract, 3.0)]
+    enum ForceFeedbackEffectState
+    {
+        Stopped = 0,
+        Running = 1,
+        Paused  = 2,
+        Faulted = 3,
+    };
+
+    [contract(Windows.Foundation.UniversalApiContract, 3.0)]
     enum ForceFeedbackLoadEffectResult
     {
         Succeeded          = 0,
@@ -60,6 +70,19 @@ namespace Windows.Gaming.Input.ForceFeedback {
 
     [
         contract(Windows.Foundation.UniversalApiContract, 3.0),
+        uuid(a17fba0c-2ae4-48c2-8063-eabd0777cb89)
+    ]
+    interface IForceFeedbackEffect : IInspectable
+    {
+        [propget] HRESULT Gain([out, retval] DOUBLE *value);
+        [propput] HRESULT Gain([in] DOUBLE value);
+        [propget] HRESULT State([out, retval] Windows.Gaming.Input.ForceFeedback.ForceFeedbackEffectState *value);
+        HRESULT Start();
+        HRESULT Stop();
+    }
+
+    [
+        contract(Windows.Foundation.UniversalApiContract, 3.0),
         exclusiveto(Windows.Gaming.Input.ForceFeedback.ForceFeedbackMotor),
         uuid(8d3d417c-a5ea-4516-8026-2b00f74ef6e5)
     ]