Push API: Validate storage before returning cached subscriptions

components/gcm_driver/instance_id/instance_id_android.h

Index: components/gcm_driver/instance_id/instance_id_android.h
diff --git a/components/gcm_driver/instance_id/instance_id_android.h b/components/gcm_driver/instance_id/instance_id_android.h
index 44302d03aa39a99cda4b5de3a4ae0ff1fef56ac1..cb3fce0fd34c2b238f6fc8963355178997bea902 100644
--- a/components/gcm_driver/instance_id/instance_id_android.h
+++ b/components/gcm_driver/instance_id/instance_id_android.h
@@ -50,6 +50,10 @@ class InstanceIDAndroid : public InstanceID {
                 const std::string& scope,
                 const std::map<std::string, std::string>& options,
                 const GetTokenCallback& callback) override;
+  void ValidateToken(const std::string& authorized_entity,
+                     const std::string& scope,
+                     const std::string& token,
+                     const ValidateTokenCallback& callback) override;
   void DeleteTokenImpl(const std::string& audience,
                        const std::string& scope,
                        const DeleteTokenCallback& callback) override;