Implement //device/bt changes for notifications.

device/bluetooth/bluetooth_local_gatt_characteristic.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_BLUETOOTH_LOCAL_GATT_CHARACTERISTIC_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_LOCAL_GATT_CHARACTERISTIC_H_
 
 #include <stdint.h>
 #include <vector>
 
@@ skipping 11 matching lines @@
 // GATT service that contains this characteristic during construction.
 //
 // Note: We use virtual inheritance on the GATT characteristic since it will be
 // inherited by platform specific versions of the GATT characteristic classes
 // also. The platform specific remote GATT characteristic classes will inherit
 // both this class and their GATT characteristic class, hence causing an
 // inheritance diamond.
 class DEVICE_BLUETOOTH_EXPORT BluetoothLocalGattCharacteristic
     : public virtual BluetoothGattCharacteristic {
  public:
+  enum NotificationStatus {
+    NOTIFICATION_SUCCESS = 0,
+    NOTIFY_PROPERTY_NOT_SET,
+    INDICATE_PROPERTY_NOT_SET,
+    SERVICE_NOT_REGISTERED,
+  };
+
   // Constructs a BluetoothLocalGattCharacteristic associated with a local GATT
   // service when the adapter is in the peripheral role.
   //
   // This method constructs a characteristic with UUID |uuid|, initial cached
   // value |value|, properties |properties|, and permissions |permissions|.
   // |value| will be cached and returned for read requests and automatically set
   // for write requests by default, unless an instance of
   // BluetoothRemoteGattService::Delegate has been provided to the associated
   // BluetoothRemoteGattService instance, in which case the delegate will handle
   // read and write requests. The service instance will contain this
   // characteristic.
   // TODO(rkc): Investigate how to handle |PROPERTY_EXTENDED_PROPERTIES|
   // correctly.
   static base::WeakPtr<BluetoothLocalGattCharacteristic> Create(
       const BluetoothUUID& uuid,
       Properties properties,
       Permissions permissions,
       BluetoothLocalGattService* service);
 
+  // Notify that the remote central that the value of this characteristic has
+  // been changed and the new value is |new_value|. |indicate| should be set to
+  // true if we want to use an indication instead of a notification. An
+  // indication waits for a response from the remote, making it more reliable
+  // but notifications may be faster.
+  virtual NotificationStatus NotifyValueChanged(
+      const std::vector<uint8_t>& new_value,
+      bool indicate) = 0;
+
  protected:
   BluetoothLocalGattCharacteristic();
   ~BluetoothLocalGattCharacteristic() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BluetoothLocalGattCharacteristic);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_LOCAL_GATT_CHARACTERISTIC_H_