Push API: Validate storage before returning cached subscriptions

components/gcm_driver/gcm_client.h

 // 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.
 
 #ifndef COMPONENTS_GCM_DRIVER_GCM_CLIENT_H_
 #define COMPONENTS_GCM_DRIVER_GCM_CLIENT_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 243 matching lines @@
 
   // Registers with the server to access the provided service.
   // Delegate::OnRegisterFinished will be called asynchronously upon completion.
   // |registration_info|: the specific information required for the
   //                      registration. For GCM, it will contain app id and
   //                      sender IDs. For InstanceID, it will contain app_id,
   //                      authorized entity and scope.
   virtual void Register(
       const linked_ptr<RegistrationInfo>& registration_info) = 0;
 
+  // Checks that the provided |registration_id| (aka token for Instance ID
+  // registrations) matches the stored registration info. Also checks sender IDs
+  // match for GCM registrations.
+  virtual bool ValidateRegistration(
+      const linked_ptr<RegistrationInfo>& registration_info,
+      const std::string& registration_id) = 0;
+
   // Unregisters from the server to stop accessing the provided service.
   // Delegate::OnUnregisterFinished will be called asynchronously upon
   // completion.
   // |registration_info|: the specific information required for the
   //                      registration. For GCM, it will contain app id (sender
   //                      IDs can be ingored). For InstanceID, it will contain
   //                      app id, authorized entity and scope.
   virtual void Unregister(
       const linked_ptr<RegistrationInfo>& registration_info) = 0;
 
@@ skipping 58 matching lines @@
   // to be set, and allows that component to later revoke the setting. It should
   // be unique.
   virtual void AddHeartbeatInterval(const std::string& scope,
                                     int interval_ms) = 0;
   virtual void RemoveHeartbeatInterval(const std::string& scope) = 0;
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_CLIENT_H_