bluetooth: Save characteristic value when notification arrives

device/bluetooth/test/test_bluetooth_adapter_observer.h

 // Copyright 2015 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_TEST_TEST_BLUETOOTH_ADAPTER_OBSERVER_H_
 #define DEVICE_BLUETOOTH_TEST_TEST_BLUETOOTH_ADAPTER_OBSERVER_H_
 
 #include <stdint.h>
 #include <string>
 #include <vector>
@@ skipping 125 matching lines @@
   }
   std::string last_gatt_characteristic_id() const {
     return last_gatt_characteristic_id_;
   }
   BluetoothUUID last_gatt_characteristic_uuid() const {
     return last_gatt_characteristic_uuid_;
   }
   std::vector<uint8_t> last_changed_characteristic_value() const {
     return last_changed_characteristic_value_;
   }
+  std::vector<std::vector<uint8_t>>
+  previous_characteristic_value_changed_values() const {
+    return previous_characteristic_value_changed_values_;
+  }
   std::string last_gatt_descriptor_id() const {
     return last_gatt_descriptor_id_;
   }
   BluetoothUUID last_gatt_descriptor_uuid() const {
     return last_gatt_descriptor_uuid_;
   }
   std::vector<uint8_t> last_changed_descriptor_value() const {
     return last_changed_descriptor_value_;
   }
 
@@ skipping 35 matching lines @@
   int gatt_characteristic_removed_count_;
   int gatt_characteristic_value_changed_count_;
   int gatt_descriptor_added_count_;
   int gatt_descriptor_removed_count_;
   int gatt_descriptor_value_changed_count_;
   std::string last_gatt_service_id_;
   BluetoothUUID last_gatt_service_uuid_;
   std::string last_gatt_characteristic_id_;
   BluetoothUUID last_gatt_characteristic_uuid_;
   std::vector<uint8_t> last_changed_characteristic_value_;
+  std::vector<std::vector<uint8_t>>
+      previous_characteristic_value_changed_values_;
   std::string last_gatt_descriptor_id_;
   BluetoothUUID last_gatt_descriptor_uuid_;
   std::vector<uint8_t> last_changed_descriptor_value_;
 
   DISALLOW_COPY_AND_ASSIGN(TestBluetoothAdapterObserver);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_TEST_TEST_BLUETOOTH_ADAPTER_OBSERVER_H_