Persist Instance ID data to GCM store.

components/gcm_driver/gcm_driver.cc

 // Copyright 2014 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/gcm_driver.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "components/gcm_driver/gcm_app_handler.h"
 
 namespace gcm {
 
+InstanceIDStore::InstanceIDStore() {
+}
+
+InstanceIDStore::~InstanceIDStore() {
+}
+
 GCMDriver::GCMDriver() : weak_ptr_factory_(this) {
 }
 
 GCMDriver::~GCMDriver() {
 }
 
 void GCMDriver::Register(const std::string& app_id,
                          const std::vector<std::string>& sender_ids,
                          const RegisterCallback& callback) {
   DCHECK(!app_id.empty());
@@ skipping 213 matching lines @@
     GCMClient::Result result) {
   // Invoke the original unregister callback.
   unregister_callback.Run(result);
 
   // Trigger the pending registration.
   DCHECK(register_callbacks_.find(app_id) != register_callbacks_.end());
   RegisterImpl(app_id, normalized_sender_ids);
 }
 
 }  // namespace gcm