Persist Instance ID data to GCM store.

components/gcm_driver/instance_id/fake_gcm_driver_for_instance_id.cc

+// Copyright 2015 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/fake_gcm_driver_for_instance_id.h"
+
+#include "base/bind.h"
+#include "base/message_loop/message_loop.h"
+
+namespace instance_id {
+
+FakeGCMDriverForInstanceID::FakeGCMDriverForInstanceID() {
+}
+
+FakeGCMDriverForInstanceID::~FakeGCMDriverForInstanceID() {
+}
+
+gcm::InstanceIDStore* FakeGCMDriverForInstanceID::GetInstanceIDStore() {
+  return this;
+}
+
+void FakeGCMDriverForInstanceID::AddInstanceIDData(
+    const std::string& app_id,
+    const std::string& instance_id_data) {
+  instance_id_data_[app_id] = instance_id_data;
+}
+
+void FakeGCMDriverForInstanceID::RemoveInstanceIDData(
+    const std::string& app_id) {
+  instance_id_data_.erase(app_id);
+}
+
+void FakeGCMDriverForInstanceID::GetInstanceIDData(
+    const std::string& app_id,
+    const gcm::InstanceIDStore::GetInstanceIDDataCallback& callback) {
+  std::string data;
+  auto iter = instance_id_data_.find(app_id);
+  if (iter != instance_id_data_.end())
+    data = iter->second;
+  base::MessageLoop::current()->PostTask(
+      FROM_HERE,
+      base::Bind(callback, data));
+}
+
+}  // namespace instance_id