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

device/bluetooth/bluetooth_adapter_unittest.cc

 // Copyright 2014 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.
 
 #include "device/bluetooth/bluetooth_adapter.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 534 matching lines @@
     return;
   }
 
   StartLowEnergyDiscoverySessionExpectedToFail();
 
   EXPECT_EQ(0, callback_count_);
   EXPECT_EQ(1, error_callback_count_);
 }
 #endif  // defined(OS_ANDROID) || defined(OS_MACOSX)
 
+// Android-only: Only Android requires location services to be turned on to scan
+// for Bluetooth devices.
+#if defined(OS_ANDROID)
+// Checks that discovery fails (instead of hanging) when location services are
+// turned off.
+TEST_F(BluetoothTest, NoLocationServices) {
+  if (!PlatformSupportsLowEnergy()) {
+    LOG(WARNING) << "Low Energy Bluetooth unavailable, skipping unit test.";
+    return;
+  }
+  InitWithFakeAdapter();
+  TestBluetoothAdapterObserver observer(adapter_);
+
+  SimulateLocationServicesOff();
+
+  StartLowEnergyDiscoverySessionExpectedToFail();
+
+  EXPECT_EQ(0, callback_count_);
+  EXPECT_EQ(1, error_callback_count_);
+}
+#endif  // defined(OS_ANDROID)
+
 #if defined(OS_ANDROID) || defined(OS_MACOSX) || defined(OS_WIN)
 // Discovers a device.
 TEST_F(BluetoothTest, DiscoverLowEnergyDevice) {
   if (!PlatformSupportsLowEnergy()) {
     LOG(WARNING) << "Low Energy Bluetooth unavailable, skipping unit test.";
     return;
   }
   InitWithFakeAdapter();
   TestBluetoothAdapterObserver observer(adapter_);
 
@@ skipping 279 matching lines @@
                                GetConnectErrorCallback(Call::NOT_EXPECTED));
   SimulateGattConnection(device);
   EXPECT_EQ(1u, adapter_->GetDevices().size());
   RemoveTimedOutDevices();
   EXPECT_EQ(0, observer.device_removed_count());
   EXPECT_EQ(1u, adapter_->GetDevices().size());
 }
 #endif  // defined(OS_ANDROID) || defined(OS_MACOSX)
 
 }  // namespace device