bluetooth: android: Implement Characteristic GetIdentifier, fix Service IDs too.

device/bluetooth/bluetooth_gatt_characteristic.h

 // Copyright 2014 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_BLUETOOTH_GATT_CHARACTERISTIC_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_GATT_CHARACTERISTIC_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 99 matching lines @@
   // set the correspoding bit in the characteristic's properties field. If
   // |properties| has |PROPERTY_EXTENDED_PROPERTIES| set, it will be ignored.
   static BluetoothGattCharacteristic* Create(const BluetoothUUID& uuid,
                                              const std::vector<uint8>& value,
                                              Properties properties,
                                              Permissions permissions);
 
   // Identifier used to uniquely identify a GATT characteristic object. This is
   // different from the characteristic UUID: while multiple characteristics with
   // the same UUID can exist on a Bluetooth device, the identifier returned from
-  // this method is unique among all characteristics of a device. The contents
-  // of the identifier are platform specific.
+  // this method is unique among all characteristics on the adapter. The
+  // contents of the identifier are platform specific.
   virtual std::string GetIdentifier() const = 0;
 
   // The Bluetooth-specific UUID of the characteristic.
   virtual BluetoothUUID GetUUID() const = 0;
 
   // Returns true, if this characteristic is hosted locally. If false, then this
   // instance represents a remote GATT characteristic.
   virtual bool IsLocal() const = 0;
 
   // Returns the value of the characteristic. For remote characteristics, this
@@ skipping 71 matching lines @@
   BluetoothGattCharacteristic();
   virtual ~BluetoothGattCharacteristic();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BluetoothGattCharacteristic);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_GATT_CHARACTERISTIC_H_