Store Origin-Trial tokens to ServiceWorkerDataBase

content/browser/service_worker/service_worker_database.proto

 // 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.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 package content;
 
+message ServiceWorkerOriginTrialFeature {
+  required string name = 1;
+  repeated string tokens = 2;
+}
+
+message ServiceWorkerOriginTrialInfo {
+  repeated ServiceWorkerOriginTrialFeature features = 1;
+}
+
 message ServiceWorkerRegistrationData {
   required int64 registration_id = 1;
   required string scope_url = 2;
   required string script_url = 3;
 
   // Versions are first stored once they successfully install and become the
   // waiting version. Then they are updated when they transition to the active
   // version.
   required int64 version_id = 4;
 
   required bool is_active = 5;
   required bool has_fetch_handler = 6;
 
   // Serialized by Time::ToInternalValue().
   required int64 last_update_check_time = 7;
 
   optional uint64 resources_total_size_bytes = 8;
 
   repeated string foreign_fetch_scope = 9;
   repeated string foreign_fetch_origin = 10;
+
+  // If the registration data was created by old Chrome (< M55),
+  // |origin_trial_tokens| is not set. In this case, we have to start the
+  // Service Worker and load the main script resource in ServiceWorkerStorage
+  // to check the HTTP header.
+  optional ServiceWorkerOriginTrialInfo origin_trial_tokens = 11;

[nhiroki, 2016/10/07 04:40:34]

Doesn't this work?

  repeated ServiceWorkerOriginTrialFeature origin_trial_tokens = 11;

In addtion, s/ServiceWorkerOriginTrialFeature/ServiceWorkerOriginTrialInfo/ if
the above works well.

[horo, 2016/10/07 05:33:32]

If we use "repeated", we can't distinguish empty (not set) or zero.

[nhiroki, 2016/10/07 05:59:04]

Thank you. I understand the situation.

 }
 
 message ServiceWorkerResourceRecord {
   required int64 resource_id = 1;
   required string url = 2;
   optional uint64 size_bytes = 3;
 }