device/bluetooth: Add a helper function to BluetoothServiceRecordBlueZ

device/bluetooth/bluez/bluetooth_service_record_bluez.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 "device/bluetooth/bluez/bluetooth_service_record_bluez.h"
 
 #include <utility>
 
 #include "base/values.h"
 
@@ skipping 27 matching lines @@
 void BluetoothServiceRecordBlueZ::AddRecordEntry(
     uint16_t id,
     const BluetoothServiceAttributeValueBlueZ& value) {
   auto it = attributes_.find(id);
   if (it != attributes_.end())
     attributes_.erase(it);
   attributes_.insert(
       std::pair<uint16_t, BluetoothServiceAttributeValueBlueZ>(id, value));
 }
 
+bool BluetoothServiceRecordBlueZ::IsAttributePresented(uint16_t id) {
+  return attributes_.find(id) != attributes_.end();
+}
+
 }  // namespace bluez