Add Settings.Global.WIFI_SCORE_PARAMS

For experimentally varying parameters of the framework's various wifi
scoring methods.

Bug: 65216267
Test: atest SettingsBackupTest
Change-Id: I6b1476aff8c18e4dd2b5ae8d41b5a48d2b4de283

core/java/android/provider/Settings.java

@@ -9618,6 +9618,21 @@ public final class Settings {
         public static final String WIFI_CONNECTED_MAC_RANDOMIZATION_ENABLED =
                 "wifi_connected_mac_randomization_enabled";
 
+        /**
+         * Parameters to adjust the performance of framework wifi scoring methods.
+         * <p>
+         * Encoded as a comma-separated key=value list, for example:
+         *   "rssi5=-80:-77:-70:-57,rssi2=-83:-80:-73:-60,horizon=15"
+         * This is intended for experimenting with new parameter values,
+         * and is normally unset or empty. The example does not include all
+         * parameters that may be honored.
+         * Default values are provided by code or device configurations.
+         * Errors in the parameters will cause the entire setting to be ignored.
+         * @hide
+         */
+        public static final String WIFI_SCORE_PARAMS =
+                "wifi_score_params";
+
        /**
         * The maximum number of times we will retry a connection to an access
         * point for which we have failed in acquiring an IP address from DHCP.

core/tests/coretests/src/android/provider/SettingsBackupTest.java

@@ -446,6 +446,7 @@ public class SettingsBackupTest {
                     Settings.Global.WIFI_SAVED_STATE,
                     Settings.Global.WIFI_SCAN_ALWAYS_AVAILABLE,
                     Settings.Global.WIFI_SCAN_INTERVAL_WHEN_P2P_CONNECTED_MS,
+                    Settings.Global.WIFI_SCORE_PARAMS,
                     Settings.Global.WIFI_SLEEP_POLICY,
                     Settings.Global.WIFI_SUPPLICANT_SCAN_INTERVAL_MS,
                     Settings.Global.WIFI_SUSPEND_OPTIMIZATIONS_ENABLED,