Add getProfileParentId (1/2)

Bluetooth service needs to natively access id of parent profile. Add
method exposing it.

Test: cts-tradefed run cts-dev -m DevicePolicyManager --test
com.android.cts.devicepolicy.ManagedProfileTest#testBluetooth
Bug: 69284968
Change-Id: I697906f2959b0736c1d3cc6af7560c27d77ce11b
diff --git a/core/java/android/os/IUserManager.aidl b/core/java/android/os/IUserManager.aidl
index e426356..6746120 100644
--- a/core/java/android/os/IUserManager.aidl
+++ b/core/java/android/os/IUserManager.aidl
@@ -35,6 +35,10 @@
      * DO NOT MOVE - UserManager.h depends on the ordering of this function.
      */
     int getCredentialOwnerProfile(int userHandle);
+    int getProfileParentId(int userHandle);
+    /*
+     * END OF DO NOT MOVE
+     */
 
     UserInfo createUser(in String name, int flags);
     UserInfo createProfileForUser(in String name, int flags, int userHandle,
diff --git a/services/core/java/com/android/server/pm/UserManagerService.java b/services/core/java/com/android/server/pm/UserManagerService.java
index 132b845..62f4a30 100644
--- a/services/core/java/com/android/server/pm/UserManagerService.java
+++ b/services/core/java/com/android/server/pm/UserManagerService.java
@@ -714,6 +714,19 @@
         }
     }
 
+    @Override
+    public int getProfileParentId(int userHandle) {
+        checkManageUsersPermission("get the profile parent");
+        synchronized (mUsersLock) {
+            UserInfo profileParent = getProfileParentLU(userHandle);
+            if (profileParent == null) {
+                return userHandle;
+            }
+
+            return profileParent.id;
+        }
+    }
+
     private UserInfo getProfileParentLU(int userHandle) {
         UserInfo profile = getUserInfoLU(userHandle);
         if (profile == null) {