device/bluetooth: Add a helper function to BluetoothServiceRecordBlueZ

device/bluetooth/bluez/bluetooth_service_record_bluez.h

Index: device/bluetooth/bluez/bluetooth_service_record_bluez.h
diff --git a/device/bluetooth/bluez/bluetooth_service_record_bluez.h b/device/bluetooth/bluez/bluetooth_service_record_bluez.h
index b19618f816900a8ae73ee9f819f92f2eeba889b5..5fb62052253f9792baedaf4de7c38d822925568b 100644
--- a/device/bluetooth/bluez/bluetooth_service_record_bluez.h
+++ b/device/bluetooth/bluez/bluetooth_service_record_bluez.h
@@ -42,11 +42,15 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothServiceRecordBlueZ {
   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_;
 };