Add Gservices settings for resolver configuration.

BUG: 25731675

Change-Id: I5c2221c5a2478fe2fa0fdf9ceeb13a932d758d33
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index d80d4be..a4a8dfc 100755
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -6902,6 +6902,33 @@
        public static final String STORAGE_BENCHMARK_INTERVAL = "storage_benchmark_interval";
 
        /**
+        * Sample validity in seconds to configure for the system DNS resolver.
+        * {@hide}
+        */
+       public static final String DNS_RESOLVER_SAMPLE_VALIDITY_SECONDS =
+               "dns_resolver_sample_validity_seconds";
+
+       /**
+        * Success threshold in percent for use with the system DNS resolver.
+        * {@hide}
+        */
+       public static final String DNS_RESOLVER_SUCCESS_THRESHOLD_PERCENT =
+                "dns_resolver_success_threshold_percent";
+
+       /**
+        * Minimum number of samples needed for statistics to be considered meaningful in the
+        * system DNS resolver.
+        * {@hide}
+        */
+       public static final String DNS_RESOLVER_MIN_SAMPLES = "dns_resolver_min_samples";
+
+       /**
+        * Maximum number taken into account for statistics purposes in the system DNS resolver.
+        * {@hide}
+        */
+       public static final String DNS_RESOLVER_MAX_SAMPLES = "dns_resolver_max_samples";
+
+       /**
         * Whether to disable the automatic scheduling of system updates.
         * 1 = system updates won't be automatically scheduled (will always
         * present notification instead).