Implement create attribute API functions for BTLE.

device/bluetooth/bluez/bluetooth_local_gatt_service_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_local_gatt_service_bluez.h>
 
 #include "base/guid.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_util.h"
@@ skipping 54 matching lines @@
   GetAdapter()->RegisterGattService(this, callback, error_callback);
 }
 
 void BluetoothLocalGattServiceBlueZ::Unregister(
     const base::Closure& callback,
     const ErrorCallback& error_callback) {
   DCHECK(GetAdapter());
   GetAdapter()->UnregisterGattService(this, callback, error_callback);
 }
 
-const std::vector<std::unique_ptr<BluetoothLocalGattCharacteristicBlueZ>>&
+device::BluetoothLocalGattCharacteristic*
+BluetoothLocalGattServiceBlueZ::GetCharacteristic(
+    const std::string& identifier) {
+  const auto& service = characteristics_.find(dbus::ObjectPath(identifier));
+  return service == characteristics_.end() ? nullptr : service->second.get();
+};
+
+const std::map<dbus::ObjectPath,
+               std::unique_ptr<BluetoothLocalGattCharacteristicBlueZ>>&
 BluetoothLocalGattServiceBlueZ::GetCharacteristics() const {
   return characteristics_;
 }
 
 // static
 dbus::ObjectPath BluetoothLocalGattServiceBlueZ::AddGuidToObjectPath(
     const std::string& path) {
   std::string GuidString = base::GenerateGUID();
   base::RemoveChars(GuidString, "-", &GuidString);
 
   return dbus::ObjectPath(path + GuidString);
 }
 
 void BluetoothLocalGattServiceBlueZ::AddCharacteristic(
     std::unique_ptr<BluetoothLocalGattCharacteristicBlueZ> characteristic) {
-  characteristics_.push_back(std::move(characteristic));
+  characteristics_[characteristic->object_path()] = std::move(characteristic);
 }
 
 }  // namespace bluez