Backport PackageListObserver#onPackageChanged.

Added internally in Ic48e3c728387ecf02f89d517ba1fe785ab9c75fd,
of which this is a partial cherry-pick.

Bug: 137864893
Test: builds, boots
Change-Id: I6975e0b70ded6047e1ac8013a82bc35ff150f03b
Merged-In: Ic48e3c728387ecf02f89d517ba1fe785ab9c75fd

core/java/android/content/pm/PackageManagerInternal.java

@@ -63,6 +63,8 @@ public abstract class PackageManagerInternal {
     public interface PackageListObserver {
         /** A package was added to the system. */
         void onPackageAdded(@NonNull String packageName, int uid);
+        /** A package was changed - either installed for a specific user or updated. */
+        default void onPackageChanged(@NonNull String packageName, int uid) {}
         /** A package was removed from the system. */
         void onPackageRemoved(@NonNull String packageName, int uid);
     }

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

@@ -2155,6 +2155,8 @@ public class PackageManagerService extends IPackageManager.Stub
 
             if (allNewUsers && !update) {
                 notifyPackageAdded(packageName, res.uid);
+            } else {
+                notifyPackageChanged(packageName, res.uid);
             }
 
             // Log current value of "unknown sources" setting
@@ -13761,6 +13763,22 @@ public class PackageManagerService extends IPackageManager.Stub
         }
     }
 
+    @Override
+    public void notifyPackageChanged(String packageName, int uid) {
+        final PackageListObserver[] observers;
+        synchronized (mPackages) {
+            if (mPackageListObservers.size() == 0) {
+                return;
+            }
+            final PackageListObserver[] observerArray =
+                    new PackageListObserver[mPackageListObservers.size()];
+            observers = mPackageListObservers.toArray(observerArray);
+        }
+        for (int i = observers.length - 1; i >= 0; --i) {
+            observers[i].onPackageChanged(packageName, uid);
+        }
+    }
+
     @Override
     public void notifyPackageRemoved(String packageName, int uid) {
         final PackageListObserver[] observers;
@@ -24987,5 +25005,6 @@ interface PackageSender {
     void sendPackageAddedForNewUsers(String packageName, boolean sendBootCompleted,
         boolean includeStopped, int appId, int[] userIds, int[] instantUserIds);
     void notifyPackageAdded(String packageName, int uid);
+    void notifyPackageChanged(String packageName, int uid);
     void notifyPackageRemoved(String packageName, int uid);
 }

services/tests/servicestests/src/com/android/server/pm/PackageManagerServiceTest.java

@@ -59,6 +59,11 @@ public class PackageManagerServiceTest {
             public void notifyPackageAdded(String packageName, int uid) {
             }
 
+            @Override
+            public void notifyPackageChanged(String packageName, int uid) {
+
+            }
+
             @Override
             public void notifyPackageRemoved(String packageName, int uid) {
             }