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

device/bluetooth/test/android/java/src/org/chromium/device/bluetooth/Fakes.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.annotation.TargetApi;
 import android.bluetooth.BluetoothDevice;
 import android.bluetooth.le.ScanFilter;
 import android.bluetooth.le.ScanSettings;
@@ skipping 50 matching lines @@
             mNativeBluetoothTestAndroid = nativeBluetoothTestAndroid;
             mFakeContext = (FakeContext) mContext;
             mFakeScanner = new FakeBluetoothLeScanner();
         }
 
         @CalledByNative("FakeBluetoothAdapter")
         public void denyPermission() {
             mFakeContext.mHasLocation = false;
         }
 
+        @CalledByNative("FakeBluetoothAdapter")
+        public void simulateLocationServicesOff() {
+            mFakeContext.mIsSystemLocationSettingEnabled = false;
+        }
+
         /**
          * Creates and discovers a new device.
          */
         @CalledByNative("FakeBluetoothAdapter")
         public void simulateLowEnergyDevice(int deviceOrdinal) {
             if (mFakeScanner == null) {
                 return;
             }
 
             switch (deviceOrdinal) {
@@ skipping 104 matching lines @@
         public boolean isDiscovering() {
             return false;
         }
     }
 
     /**
      * Fakes android.content.Context.
      */
     static class FakeContext extends Wrappers.ContextWrapper {
         public boolean mHasLocation = true;
+        public boolean mIsSystemLocationSettingEnabled = true;
 
         public FakeContext() {
             super(null);
         }
 
         @Override
         public boolean hasAndroidLocationPermission() {
             return mHasLocation;
         }
 
         @Override
+        public boolean isSystemLocationSettingEnabled() {
+            return mIsSystemLocationSettingEnabled;
+        }
+
+        @Override
         public Intent registerReceiver(BroadcastReceiver receiver, IntentFilter filter) {
             return null;
         }
 
         @Override
         public void unregisterReceiver(BroadcastReceiver receiver) {}
     }
 
     /**
      * Fakes android.bluetooth.le.BluetoothLeScanner.
@@ skipping 595 matching lines @@
             long nativeBluetoothTestAndroid, byte[] value);
 
     // Binds to BluetoothTestAndroid::OnFakeBluetoothGattReadDescriptor.
     private static native void nativeOnFakeBluetoothGattReadDescriptor(
             long nativeBluetoothTestAndroid);
 
     // Binds to BluetoothTestAndroid::OnFakeBluetoothGattWriteDescriptor.
     private static native void nativeOnFakeBluetoothGattWriteDescriptor(
             long nativeBluetoothTestAndroid, byte[] value);
 }