Add listener for AdapterDiscoveringChanged on BT chooser-controller

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 384 matching lines @@
       OnBluetoothChooserEvent(BluetoothChooser::Event::RESCAN,
                               "" /* device_address */);
     }
   }
 
   if (!powered) {
     discovery_session_timer_.Stop();
   }
 }
 
+void BluetoothDeviceChooserController::AdapterDiscoveringChanged(
+    bool discovering) {
+  if (!discovering && discovery_session_ && discovery_session_->IsActive())
+    StopDeviceDiscovery();
+}
+
 int BluetoothDeviceChooserController::CalculateSignalStrengthLevel(
     int8_t rssi) {
   RecordRSSISignalStrength(rssi);
 
   if (rssi <= kMinRSSI) {
     RecordRSSISignalStrengthLevel(
         UMARSSISignalStrengthLevel::LESS_THAN_OR_EQUAL_TO_MIN_RSSI);
     return 0;
   }
 
@@ skipping 140 matching lines @@
 
 void BluetoothDeviceChooserController::PostErrorCallback(
     blink::mojom::WebBluetoothResult error) {
   if (!base::ThreadTaskRunnerHandle::Get()->PostTask(
           FROM_HERE, base::Bind(error_callback_, error))) {
     LOG(WARNING) << "No TaskRunner.";
   }
 }
 
 }  // namespace content