Send data stall data to statsd

Short term fix to send the metrics via legacy API. This allows
data stall metrics available in internal branch.

Bug: 120452078
Test: atest NetworkStackTests and test against statsd
Change-Id: I4dd08086f4aee12bbb9478551d8039e9bb6a381e

packages/NetworkStack/src/android/net/metrics/DataStallStatsUtils.java

@@ -20,6 +20,7 @@ import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.net.captiveportal.CaptivePortalProbeResult;
 import android.util.Log;
+import android.util.StatsLog;
 
 import com.android.internal.util.HexDump;
 import com.android.server.connectivity.nano.DataStallEventProto;
@@ -36,6 +37,7 @@ import com.android.server.connectivity.nano.DataStallEventProto;
  */
 public class DataStallStatsUtils {
     private static final String TAG = DataStallStatsUtils.class.getSimpleName();
+    private static final int DATA_STALL_EVENT_ID = 121;
     private static final boolean DBG = false;
 
     private static int probeResultToEnum(@Nullable final CaptivePortalProbeResult result) {
@@ -61,6 +63,13 @@ public class DataStallStatsUtils {
             Log.d(TAG, "write: " + stats + " with result: " + validationResult
                     + ", dns: " + HexDump.toHexString(stats.mDns));
         }
-        // TODO(b/124613085): Send to Statsd once the public StatsLog API is ready.
+        // TODO(b/124613085): Update API once the public StatsLog API is ready.
+        StatsLog.write(DATA_STALL_EVENT_ID,
+                stats.mEvaluationType,
+                validationResult,
+                stats.mNetworkType,
+                stats.mWifiInfo,
+                stats.mCellularInfo,
+                stats.mDns);
     }
 }