HCE/SE foreground support.

Allow apps to tell the OS they prefer a specific
CardEmulation service to handle a transaction
whenever they are in the foreground.

Change-Id: I8489ba6018f62164ed7e3504f31c8d09accf494e
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 0eb994d..29aa83e 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -4522,6 +4522,12 @@
         public static final String NFC_PAYMENT_DEFAULT_COMPONENT = "nfc_payment_default_component";
 
         /**
+         * Whether NFC payment is handled by the foreground application or a default.
+         * @hide
+         */
+        public static final String NFC_PAYMENT_FOREGROUND = "nfc_payment_foreground";
+
+        /**
          * Specifies the package name currently configured to be the primary sms application
          * @hide
          */