arc/bluetooth: plumb adapter discoverable timeout property

components/arc/bluetooth/arc_bluetooth_bridge.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 "components/arc/bluetooth/arc_bluetooth_bridge.h"
 
 #include <fcntl.h>
 #include <stddef.h>
 
 #include <iomanip>
@@ skipping 64 matching lines @@
 
 ArcBluetoothBridge::~ArcBluetoothBridge() {
   arc_bridge_service()->RemoveObserver(this);
 
   if (bluetooth_adapter_)
     bluetooth_adapter_->RemoveObserver(this);
 }
 
 void ArcBluetoothBridge::OnAdapterInitialized(
     scoped_refptr<BluetoothAdapter> adapter) {
-  bluetooth_adapter_ = adapter;
+  // We can downcast here because we are always running on Chrome OS, and
+  // so our adapter uses BlueZ.
+  bluetooth_adapter_ =
+      static_cast<bluez::BluetoothAdapterBlueZ*>(adapter.get());
   bluetooth_adapter_->AddObserver(this);
 }
 
 void ArcBluetoothBridge::OnBluetoothInstanceReady() {
   mojom::BluetoothInstance* bluetooth_instance =
       arc_bridge_service()->bluetooth_instance();
   if (!bluetooth_instance) {
     LOG(ERROR) << "OnBluetoothInstanceReady called, "
                << "but no bluetooth instance found";
     return;
@@ skipping 1082 matching lines @@
           mojom::BluetoothAddress::From(device->GetAddress());
       bonded_devices.push_back(std::move(addr));
     }
 
     btp->set_bonded_devices(std::move(bonded_devices));
     properties.push_back(std::move(btp));
   }
   if (type == mojom::BluetoothPropertyType::ALL ||
       type == mojom::BluetoothPropertyType::ADAPTER_DISCOVERY_TIMEOUT) {
     mojom::BluetoothPropertyPtr btp = mojom::BluetoothProperty::New();
-    btp->set_discovery_timeout(120);
+    btp->set_discovery_timeout(bluetooth_adapter_->GetDiscoverableTimeout());
     properties.push_back(std::move(btp));
   }
 
   return properties;
 }
 
 // Android support 5 types of Advertising Data.
 // However Chrome didn't expose AdvertiseFlag and ManufacturerData.
 // So we will only expose local_name, service_uuids and service_data.
 // TODO(crbug.com/618442) Make Chrome expose missing data.
@@ skipping 112 matching lines @@
     // to
     // make sure the bond state machine on Android is ready to take the
     // pair-done event. Otherwise the pair-done event will be dropped as an
     // invalid change of paired status.
     OnPairing(addr->Clone());
     OnPairedDone(std::move(addr));
   }
 }
 
 }  // namespace arc