DO NOT MERGE Prevent isEnabled from mutating state am: ff147d50

                if (enabled == null) {

                    // this generally shouldn't occur, but might be possible due to race conditions

                    // on when we are notified of new users

                    // hack to fix b/171910679. mutating the user enabled state within this method

                    // may cause unexpected changes to other state (for instance, this could cause

                    // provider enable/disable notifications to be sent to clients, which could

                    // result in a dead client being detected, which could result in the client

                    // being removed, which means that if this function is called while clients are

                    // being iterated over we have now unexpectedly mutated the iterated

                    // collection). instead, we return a correct value immediately here, and

                    // schedule the actual update for later. this has been completely rewritten and

                    // is no longer a problem in the next version of android.

                    enabled = mProvider.getState().allowed

                            && mUserInfoHelper.isCurrentUserId(userId)

                            && mSettingsHelper.isLocationEnabled(userId);

                    Log.w(TAG, mName + " provider saw user " + userId + " unexpectedly");

                    mHandler.post(() -> {

                        synchronized (mLock) {

                            onEnabledChangedLocked(userId);

                    enabled = Objects.requireNonNull(mEnabled.get(userId));

                        }

                    });

                }

                return enabled;