Fix insufficient synchronization (8/n)

mSyncRequired must be accessed within the lock.

Bug: 178675924
Test: atest PackageWatchdogTest
Change-Id: Ie975e5910de53af670862de48ccf0cd4eeff0184

services/core/java/com/android/server/PackageWatchdog.java

@@ -259,10 +259,7 @@ public class PackageWatchdog {
             mIsPackagesReady = true;
             mHealthCheckController.setCallbacks(packageName -> onHealthCheckPassed(packageName),
                     packages -> onSupportedPackages(packages),
-                    () -> {
-                            mSyncRequired = true;
-                            syncRequestsAsync();
-                    });
+                    this::onSyncRequestNotified);
             setPropertyChangedListenerLocked();
             updateConfigs();
             registerConnectivityModuleHealthListener();
@@ -789,6 +786,13 @@ public class PackageWatchdog {
         }
     }
 
+    private void onSyncRequestNotified() {
+        synchronized (mLock) {
+            mSyncRequired = true;
+            syncRequestsAsync();
+        }
+    }
+
     @GuardedBy("mLock")
     private Set<String> getPackagesPendingHealthChecksLocked() {
         Set<String> packages = new ArraySet<>();