Persist Instance ID data to GCM store.

components/gcm_driver/instance_id/instance_id_android.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/instance_id_android.h"
 
 #include "base/logging.h"
 
 namespace instance_id {
 
 // static
 InstanceID* InstanceID::Create(const std::string& app_id,
                                gcm::GCMDriver* gcm_driver) {
   return new InstanceIDAndroid(app_id);
 }
 
 InstanceIDAndroid::InstanceIDAndroid(const std::string& app_id)
     : InstanceID(app_id) {
 }
 
 InstanceIDAndroid::~InstanceIDAndroid() {
 }
 
-std::string InstanceIDAndroid::GetID() {
+void InstanceIDAndroid::GetID(const GetIDCallback& callback) {
   NOTIMPLEMENTED();
-  return std::string();
 }
 
-base::Time InstanceIDAndroid::GetCreationTime() {
+void InstanceIDAndroid::GetCreationTime(
+    const GetCreationTimeCallback& callback) {
   NOTIMPLEMENTED();
-  return base::Time();
 }
 
 void InstanceIDAndroid::GetToken(
     const std::string& audience,
     const std::string& scope,
     const std::map<std::string, std::string>& options,
     const GetTokenCallback& callback) {
   NOTIMPLEMENTED();
 }
 
 void InstanceIDAndroid::DeleteToken(const std::string& audience,
                                     const std::string& scope,
                                     const DeleteTokenCallback& callback) {
   NOTIMPLEMENTED();
 }
 
 void InstanceIDAndroid::DeleteID(const DeleteIDCallback& callback) {
   NOTIMPLEMENTED();
 }
 
 }  // namespace instance_id