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

components/gcm_driver/instance_id/instance_id_impl_factory.cc

Index: components/gcm_driver/instance_id/instance_id_impl_factory.cc
diff --git a/components/gcm_driver/instance_id/instance_id_impl_factory.cc b/components/gcm_driver/instance_id/instance_id_impl_factory.cc
new file mode 100644
index 0000000000000000000000000000000000000000..99f8d40fe73f3f33b448f597b75ebf8c032d27dc
--- /dev/null
+++ b/components/gcm_driver/instance_id/instance_id_impl_factory.cc
@@ -0,0 +1,18 @@
+// 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.
+
+#include "components/gcm_driver/instance_id/instance_id_impl_factory.h"
+
+#include "base/memory/ptr_util.h"
+#include "components/gcm_driver/instance_id/instance_id_impl.h"
+
+namespace instance_id {
+
+std::unique_ptr<InstanceID> InstanceIDImplFactory::Create(
+    const std::string& app_id,
+    gcm::GCMDriver* gcm_driver) {
+  return base::MakeUnique<InstanceIDImpl>(app_id, gcm_driver);
+}
+
+}  // namespace instance_id