bluetooth: Perform an LE scan only

content/browser/bluetooth/bluetooth_device_chooser_controller.cc

 // Copyright 2016 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 "content/browser/bluetooth/bluetooth_device_chooser_controller.h"
 
 #include <set>
 #include <string>
 #include <unordered_set>
 
@@ skipping 130 matching lines @@
 }
 
 std::unique_ptr<device::BluetoothDiscoveryFilter> ComputeScanFilter(
     const mojo::Array<blink::mojom::WebBluetoothScanFilterPtr>& filters) {
   std::unordered_set<BluetoothUUID, device::BluetoothUUIDHash> services;
   for (const auto& filter : filters) {
     for (const base::Optional<BluetoothUUID>& service : filter->services) {
       services.insert(service.value());
     }
   }
+  // There isn't much support for GATT over BR/EDR from neither platforms nor
+  // devices so performing a Dual scan will find devices that the API is not
+  // able to interact with. To avoid wasting power and confusing users with
+  // devices they are not able to interact with, we only perform an LE Scan.
   auto discovery_filter = base::MakeUnique<device::BluetoothDiscoveryFilter>(
-      device::BLUETOOTH_TRANSPORT_DUAL);
+      device::BLUETOOTH_TRANSPORT_LE);
   for (const BluetoothUUID& service : services) {
     discovery_filter->AddUUID(service);
   }
   return discovery_filter;
 }
 
 void StopDiscoverySession(
     std::unique_ptr<device::BluetoothDiscoverySession> discovery_session) {
   // Nothing goes wrong if the discovery session fails to stop, and we don't
   // need to wait for it before letting the user's script proceed, so we ignore
@@ skipping 346 matching lines @@
 
 void BluetoothDeviceChooserController::PostErrorCallback(
     blink::mojom::WebBluetoothError error) {
   if (!base::ThreadTaskRunnerHandle::Get()->PostTask(
           FROM_HERE, base::Bind(error_callback_, error))) {
     LOG(WARNING) << "No TaskRunner.";
   }
 }
 
 }  // namespace content