Restart accessibility services after they update.

In ag/1273924, we stopped restarting services that were
still bound. When the package changes, however, the system
unbinds from a service and has no way to tell us that it is
not going to restart it (as it would if the service
crashed.)

Now we listen for package updates and unbind affected
services. The services will then be restarted as there will
be enabled services that are no longer bound.

Bug: 30866905
Change-Id: I375edfd6a37ed25f959ec354930cec8f288deb6b

services/accessibility/java/com/android/server/accessibility/AccessibilityManagerService.java

@@ -278,6 +278,31 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub {
                 }
             }
 
+            @Override
+            public void onPackageUpdateFinished(String packageName, int uid) {
+                // Unbind all services from this package, and then update the user state to
+                // re-bind new versions of them.
+                synchronized (mLock) {
+                    final int userId = getChangingUserId();
+                    if (userId != mCurrentUserId) {
+                        return;
+                    }
+                    UserState userState = getUserStateLocked(userId);
+                    boolean unboundAService = false;
+                    for (int i = userState.mBoundServices.size() - 1; i >= 0; i--) {
+                        Service boundService = userState.mBoundServices.get(i);
+                        String servicePkg = boundService.mComponentName.getPackageName();
+                        if (servicePkg.equals(packageName)) {
+                            boundService.unbindLocked();
+                            unboundAService = true;
+                        }
+                    }
+                    if (unboundAService) {
+                        onUserStateChangedLocked(userState);
+                    }
+                }
+            }
+
             @Override
             public void onPackageRemoved(String packageName, int uid) {
                 synchronized (mLock) {