If location services are turned off, have the BT chooser prompt the user to turn them on.

device/bluetooth/android/java/src/org/chromium/device/bluetooth/Wrappers.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.device.bluetooth;
 
 import android.Manifest;
 import android.annotation.TargetApi;
 import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
 import android.bluetooth.BluetoothGatt;
 import android.bluetooth.BluetoothGattCallback;
 import android.bluetooth.BluetoothGattCharacteristic;
 import android.bluetooth.BluetoothGattDescriptor;
 import android.bluetooth.BluetoothGattService;
 import android.bluetooth.le.BluetoothLeScanner;
 import android.bluetooth.le.ScanCallback;
 import android.bluetooth.le.ScanFilter;
 import android.bluetooth.le.ScanResult;
 import android.bluetooth.le.ScanSettings;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.pm.PackageManager;
+import android.location.LocationManager;
 import android.os.Build;
 import android.os.ParcelUuid;
 import android.os.Process;
 
 import org.chromium.base.Log;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ skipping 124 matching lines @@
 
         public ContextWrapper(Context context) {
             mContext = context;
         }
 
         public boolean checkPermission(String permission) {
             return mContext.checkPermission(permission, Process.myPid(), Process.myUid())
                     == PackageManager.PERMISSION_GRANTED;
         }
 
+        public LocationManagerWrapper getLocationManager() {
+            return new LocationManagerWrapper(
+                    (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE));
+        }
+
         public Intent registerReceiver(BroadcastReceiver receiver, IntentFilter filter) {
             return mContext.registerReceiver(receiver, filter);
         }
 
         public void unregisterReceiver(BroadcastReceiver receiver) {
             mContext.unregisterReceiver(receiver);
         }
     }
 
+    static class LocationManagerWrapper {
+        private final LocationManager mLocationManager;
+
+        public LocationManagerWrapper(LocationManager locationManager) {
+            mLocationManager = locationManager;
+        }
+
+        public boolean isProviderEnabled(String name) {
+            return mLocationManager.isProviderEnabled(name);
+        }
+    }
+
     /**
      * Wraps android.bluetooth.BluetoothLeScanner.
      */
     static class BluetoothLeScannerWrapper {
         protected final BluetoothLeScanner mScanner;
         private final HashMap<ScanCallbackWrapper, ForwardScanCallbackToWrapper> mCallbacks;
 
         public BluetoothLeScannerWrapper(BluetoothLeScanner scanner) {
             mScanner = scanner;
             mCallbacks = new HashMap<ScanCallbackWrapper, ForwardScanCallbackToWrapper>();
@@ skipping 391 matching lines @@
 
         public byte[] getValue() {
             return mDescriptor.getValue();
         }
 
         public boolean setValue(byte[] value) {
             return mDescriptor.setValue(value);
         }
     }
 }