device/bluetooth: Add a helper function to BluetoothServiceRecordBlueZ

device/bluetooth/bluez/bluetooth_service_record_bluez.h

 // 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.
 
 #ifndef DEVICE_BLUETOOTH_BLUEZ_BLUETOOTH_SERVICE_RECORD_BLUEZ_H_
 #define DEVICE_BLUETOOTH_BLUEZ_BLUETOOTH_SERVICE_RECORD_BLUEZ_H_
 
 #include <cstdint>
 #include <map>
 #include <vector>
@@ skipping 24 matching lines @@
   BluetoothServiceRecordBlueZ();
   BluetoothServiceRecordBlueZ(const BluetoothServiceRecordBlueZ& record);
   ~BluetoothServiceRecordBlueZ();
 
   // Returns a list of Attribute IDs that exist within this service record.
   const std::vector<uint16_t> GetAttributeIds() const;
   // Returns the value associated with a given attribute ID in |value|.
   const BluetoothServiceAttributeValueBlueZ& GetAttributeValue(
       uint16_t attribute_id) const;
 
-  // Add an an entry to this service record. If a record with the given ID
-  // already exists, it is replaced.
+  // Adds an entry to this service record. If a record with the given ID already
+  // exists, it is replaced.
   void AddRecordEntry(uint16_t id,
                       const BluetoothServiceAttributeValueBlueZ& value);
 
+  // Returns true if the given attribute ID is found in the attribute map, false
+  // otherwise.
+  bool IsAttributePresented(uint16_t id);
+
  private:
   std::map<uint16_t, BluetoothServiceAttributeValueBlueZ> attributes_;
 };
 
 }  // namespace bluez
 
 #endif  // DEVICE_BLUETOOTH_BLUEZ_BLUETOOTH_SERVICE_RECORD_BLUEZ_H_