Push API: Validate storage before returning cached subscriptions

components/gcm_driver/instance_id/fake_gcm_driver_for_instance_id.h

 // 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 <utility>
@@ skipping 29 matching lines @@
     return last_deletetoken_app_id_;
   }
 
  protected:
   // InstanceIDHandler overrides:
   void GetToken(const std::string& app_id,
                 const std::string& authorized_entity,
                 const std::string& scope,
                 const std::map<std::string, std::string>& options,
                 const GetTokenCallback& callback) override;
+  void ValidateToken(const std::string& app_id,
+                     const std::string& authorized_entity,
+                     const std::string& scope,
+                     const std::string& token,
+                     const ValidateTokenCallback& callback) override;
   void DeleteToken(const std::string& app_id,
                    const std::string& authorized_entity,
                    const std::string& scope,
                    const DeleteTokenCallback& callback) override;
   void AddInstanceIDData(const std::string& app_id,
                          const std::string& instance_id,
                          const std::string& extra_data) override;
   void RemoveInstanceIDData(const std::string& app_id) override;
   void GetInstanceIDData(
       const std::string& app_id,
       const GetInstanceIDDataCallback& callback) override;
 
  private:
   std::map<std::string, std::pair<std::string, std::string>> instance_id_data_;
   std::map<std::string, std::string> tokens_;
   std::string last_gettoken_app_id_;
   std::string last_gettoken_authorized_entity_;
   std::string last_deletetoken_app_id_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeGCMDriverForInstanceID);
 };
 
 }  // namespace instance_id
 
 #endif  // COMPONENTS_GCM_DRIVER_INSTANCE_ID_FAKE_GCM_DRIVER__FOR_INSTANCE_ID_H_