Add listener for AdapterDiscoveringChanged on BT chooser-controller

content/browser/bluetooth/web_bluetooth_service_impl.cc

Index: content/browser/bluetooth/web_bluetooth_service_impl.cc
diff --git a/content/browser/bluetooth/web_bluetooth_service_impl.cc b/content/browser/bluetooth/web_bluetooth_service_impl.cc
index 5adce0eeaf41874eec81f3bf15c7b6341768c44f..e687c50d7cb8203588f7ca2cb73dfa55aab9af18 100644
--- a/content/browser/bluetooth/web_bluetooth_service_impl.cc
+++ b/content/browser/bluetooth/web_bluetooth_service_impl.cc
@@ -212,6 +212,15 @@ void WebBluetoothServiceImpl::AdapterPoweredChanged(
   }
 }
 
+void WebBluetoothServiceImpl::AdapterDiscoveringChanged(
+    device::BluetoothAdapter* adapter,
+    bool discovering) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  if (device_chooser_controller_.get()) {
+    device_chooser_controller_->AdapterDiscoveringChanged(discovering);
+  }
+}
+
 void WebBluetoothServiceImpl::DeviceAdded(device::BluetoothAdapter* adapter,
                                           device::BluetoothDevice* device) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);