Add accessor for buckets scanned in ScanData

Bug: 27506257
Change-Id: I9f7ae27ef8416de5e1b00dc63ee458e9e2ba69ab

wifi/java/android/net/wifi/WifiScanner.java

@@ -322,6 +322,11 @@ public class WifiScanner {
             return mFlags;
         }
 
+        /** {@hide} */
+        public int getBucketsScanned() {
+            return mBucketsScanned;
+        }
+
         public ScanResult[] getResults() {
             return mResults;
         }