Strip names out of externally supplied WorkSources to WifiManager (b/10710007).

Change-Id: I69bd7ce9e942c2f9327415b2821d805e1b50a1a4

core/java/android/os/WorkSource.java

@@ -96,6 +96,16 @@ public class WorkSource implements Parcelable {
         return mNames != null ? mNames[index] : null;
     }
 
+    /**
+     * Clear names from this WorkSource.  Uids are left intact.
+     *
+     * <p>Useful when combining with another WorkSource that doesn't have names.
+     * @hide
+     */
+    public void clearNames() {
+        mNames = null;
+    }
+
     /**
      * Clear this WorkSource to be empty.
      */

services/java/com/android/server/wifi/WifiService.java

@@ -342,6 +342,9 @@ public final class WifiService extends IWifiManager.Stub {
         enforceChangePermission();
         if (workSource != null) {
             enforceWorkSourcePermission();
+            // WifiManager currently doesn't use names, so need to clear names out of the
+            // supplied WorkSource to allow future WorkSource combining.
+            workSource.clearNames();
         }
         mWifiStateMachine.startScan(Binder.getCallingUid(), workSource);
     }