device/bluetooth: Add read_mtu as an argument of BluetoothAudioSinkDataAvailable.

chromeos/dbus/fake_bluetooth_media_transport_client.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 CHROMEOS_DBUS_FAKE_BLUETOOTH_MEDIA_TRANSPORT_CLIENT_H_
 #define CHROMEOS_DBUS_FAKE_BLUETOOTH_MEDIA_TRANSPORT_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 27 matching lines @@
   static const char kTransportPath[];
 
   // The default properties including device, codec, configuration, state, delay
   // and volume, owned by a fake media transport object we emulate.
   static const char kTransportDevicePath[];
   static const uint8_t kTransportCodec;
   static const std::vector<uint8_t> kTransportConfiguration;
   static const uint16_t kTransportDelay;
   static const uint16_t kTransportVolume;
 
+  // The default MTUs for read and write.
+  static const uint16_t kDefaultReadMtu;
+  static const uint16_t kDefaultWriteMtu;
+
   FakeBluetoothMediaTransportClient();
   ~FakeBluetoothMediaTransportClient() override;
 
   // DBusClient override.
   void Init(dbus::Bus* bus) override;
 
   // BluetoothMediaTransportClient override.
   void AddObserver(Observer* observer) override;
   void RemoveObserver(Observer* observer) override;
   Properties* GetProperties(const dbus::ObjectPath& object_path) override;
@@ skipping 77 matching lines @@
   std::map<dbus::ObjectPath, dbus::ObjectPath> transport_to_endpoint_map_;
 
   ObserverList<BluetoothMediaTransportClient::Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeBluetoothMediaTransportClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_FAKE_BLUETOOTH_MEDIA_TRANSPORT_CLIENT_H_