Make updatedMillis a private field

Test: make
Bug: 122677682
Change-Id: I54804d589994b01ac358ac5a9d55672ee7339771

services/core/java/com/android/server/pm/PackageInstallerService.java

@@ -360,7 +360,7 @@ public class PackageInstallerService extends IPackageInstaller.Stub implements
 
                         final long age = System.currentTimeMillis() - session.createdMillis;
                         final long timeSinceUpdate =
-                                System.currentTimeMillis() - session.updatedMillis;
+                                System.currentTimeMillis() - session.getUpdatedMillis();
                         final boolean valid;
                         if (session.isStaged()) {
                             if (timeSinceUpdate >= MAX_TIME_SINCE_UPDATE_MILLIS

services/core/java/com/android/server/pm/PackageInstallerSession.java

@@ -202,7 +202,7 @@ public class PackageInstallerSession extends IPackageInstallerSession.Stub {
 
     /** Timestamp of the last time this session changed state  */
     @GuardedBy("mLock")
-    long updatedMillis;
+    private long updatedMillis;
 
     /** Uid of the creator of this session. */
     private final int mOriginalInstallerUid;
@@ -1740,6 +1740,15 @@ public class PackageInstallerSession extends IPackageInstallerSession.Stub {
         }
     }
 
+    /**
+     * @return the timestamp of when this session last changed state
+     */
+    public long getUpdatedMillis() {
+        synchronized (mLock) {
+            return updatedMillis;
+        }
+    }
+
     String getInstallerPackageName() {
         synchronized (mLock) {
             return mInstallerPackageName;