Add FEATURE_GAMEPAD.

This allows micro-consoles or other devices to signify that there's a
game controller in the box, even if the user hasn't connected it.

Change-Id: Ie5e2cf69f777ebe84abb83f34c9ed63d9555deff

core/java/android/content/pm/PackageManager.java

@@ -1545,6 +1545,15 @@ public abstract class PackageManager {
     @SdkConstant(SdkConstantType.FEATURE)
     public static final String FEATURE_HDMI_CEC = "android.hardware.hdmi.cec";
 
+    /**
+     * Feature for {@link #getSystemAvailableFeatures} and {@link #hasSystemFeature}:
+     * The device has all of the inputs necessary to be considered a compatible game controller, or
+     * includes a compatible game controller in the box.
+     */
+    @SdkConstant(SdkConstantType.FEATURE)
+    public static final String FEATURE_GAMEPAD = "android.hardware.gamepad";
+
+
     /**
      * Action to external storage service to clean out removed apps.
      * @hide