Persist Instance ID data to GCM store.

components/gcm_driver/instance_id/fake_gcm_driver_for_instance_id.h

Index: components/gcm_driver/instance_id/fake_gcm_driver_for_instance_id.h
diff --git a/components/gcm_driver/instance_id/fake_gcm_driver_for_instance_id.h b/components/gcm_driver/instance_id/fake_gcm_driver_for_instance_id.h
new file mode 100644
index 0000000000000000000000000000000000000000..d5f9dd112faccfcdc28614cdb9a95a6892dff71e
--- /dev/null
+++ b/components/gcm_driver/instance_id/fake_gcm_driver_for_instance_id.h
@@ -0,0 +1,42 @@
+// 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.
+
+#ifndef COMPONENTS_GCM_DRIVER_INSTANCE_ID_FAKE_GCM_DRIVER__FOR_INSTANCE_ID_H_
+#define COMPONENTS_GCM_DRIVER_INSTANCE_ID_FAKE_GCM_DRIVER__FOR_INSTANCE_ID_H_
+
+#include <map>
+#include <string>
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "components/gcm_driver/fake_gcm_driver.h"
+
+namespace instance_id {
+
+class FakeGCMDriverForInstanceID : public gcm::FakeGCMDriver,
+                                   public gcm::InstanceIDStore {
+ public:
+  FakeGCMDriverForInstanceID();
+  ~FakeGCMDriverForInstanceID() override;
+
+  // FakeGCMDriver overrides:
+  gcm::InstanceIDStore* GetInstanceIDStore() override;
+
+  // InstanceIDStore overrides:
+  void AddInstanceIDData(const std::string& app_id,
+                         const std::string& instance_id_data) override;
+  void RemoveInstanceIDData(const std::string& app_id) override;
+  void GetInstanceIDData(
+      const std::string& app_id,
+      const gcm::InstanceIDStore::GetInstanceIDDataCallback& callback) override;
+
+ private:
+  std::map<std::string, std::string> instance_id_data_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeGCMDriverForInstanceID);
+};
+
+}  // namespace instance_id
+
+#endif  // COMPONENTS_GCM_DRIVER_INSTANCE_ID_FAKE_GCM_DRIVER__FOR_INSTANCE_ID_H_