Only do the ble scan if association isNotifyOnDeviceNearby

We do not need to blescan the nearby devices if they are
not isNotifyOnDeviceNearby.

Bug: 223323702
Test: Manually test on CTS verifier test.

Change-Id: Ibfc87b78ed38de17595f07e4c8e7b362c0848257

services/companion/java/com/android/server/companion/CompanionDeviceManagerService.java

@@ -671,6 +671,9 @@ public class CompanionDeviceManagerService extends SystemService {
             association = AssociationInfo.builder(association)
                     .setNotifyOnDeviceNearby(active)
                     .build();
+            // Do not need to call {@link BleCompanionDeviceScanner#restartScan()} since it will
+            // trigger {@link BleCompanionDeviceScanner#restartScan(int, AssociationInfo)} when
+            // an application sets/unsets the mNotifyOnDeviceNearby flag.
             mAssociationStore.updateAssociation(association);
 
             // TODO(b/218615198): correctly handle the case when the device is currently present.

services/companion/java/com/android/server/companion/presence/BleCompanionDeviceScanner.java

@@ -194,6 +194,8 @@ class BleCompanionDeviceScanner implements AssociationStore.OnChangeListener {
         // Collect MAC addresses from all associations.
         final Set<String> macAddresses = new HashSet<>();
         for (AssociationInfo association : mAssociationStore.getAssociations()) {
+            if (!association.isNotifyOnDeviceNearby()) continue;
+
             // Beware that BT stack does not consider low-case MAC addresses valid, while
             // MacAddress.toString() return a low-case String.
             final String macAddress = association.getDeviceMacAddressAsString();