[Chromecast] Add method to CastCdm for the session expiration updating.

components/gcm_driver/instance_id/instance_id_factory.h

+// Copyright 2017 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 COMPONENTS_GCM_DRIVER_INSTANCE_ID_INSTANCE_ID_FACTORY_H_
+#define COMPONENTS_GCM_DRIVER_INSTANCE_ID_INSTANCE_ID_FACTORY_H_
+
+#include <memory>
+#include <string>
+
+namespace gcm {
+class GCMDriver;
+}
+
+namespace instance_id {
+
+class InstanceID;
+
+class InstanceIDFactory {
+ public:
+  virtual ~InstanceIDFactory() = default;
+
+  // Creates a new instance of InstanceID. The testing code could override this
+  // to provide a mocked instance.
+  // |app_id|: identifies the application that uses the Instance ID.
+  // |handler|: provides the GCM functionality needed to support Instance ID.
+  //            Must outlive this class. On Android, this can be null instead.
+  virtual std::unique_ptr<InstanceID> Create(const std::string& app_id,
+                                             gcm::GCMDriver* gcm_driver) = 0;
+};
+
+}  // namespace instance_id
+
+#endif  // COMPONENTS_GCM_DRIVER_INSTANCE_ID_INSTANCE_ID_FACTORY_H_