Permission flag updates now notify listeners

Added a version of the onPermissionUpdated and
onInstallPermissionUpdated methods which will notify
OnPermissionChangedListeners, and added this to the
PermissionManagerService "updatePermissionFlags" and
"updatePermissionFlagsForAllApps" methods. Also adds
OnPermissionsChangedListener to @TestApi

Fixes: 135937566
Test: atest PermissionUpdateListenerTest
Change-Id: I906598c366234c3daaa202261678bca04837cb13
diff --git a/test-mock/api/test-current.txt b/test-mock/api/test-current.txt
index a87e2f5..cc260ac 100644
--- a/test-mock/api/test-current.txt
+++ b/test-mock/api/test-current.txt
@@ -7,6 +7,7 @@
   }
 
   @Deprecated public class MockPackageManager extends android.content.pm.PackageManager {
+    method public void addOnPermissionsChangeListener(android.content.pm.PackageManager.OnPermissionsChangedListener);
     method public boolean arePermissionsIndividuallyControlled();
     method public String getDefaultBrowserPackageNameAsUser(int);
     method public int getInstallReason(String, android.os.UserHandle);
@@ -18,6 +19,7 @@
     method @NonNull public String getServicesSystemSharedLibraryPackageName();
     method @NonNull public String getSharedSystemSharedLibraryPackageName();
     method public void grantRuntimePermission(String, String, android.os.UserHandle);
+    method public void removeOnPermissionsChangeListener(android.content.pm.PackageManager.OnPermissionsChangedListener);
     method public void revokeRuntimePermission(String, String, android.os.UserHandle);
     method public void updatePermissionFlags(String, String, int, int, android.os.UserHandle);
   }