[BackgroundSync] Add new registration options from the spec

content/browser/background_sync/background_sync.proto

 // 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.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 package content;
 
+enum SyncNetworkState {
+  NETWORK_STATE_ANY = 0;
+  NETWORK_STATE_AVOID_CELLULAR = 1;
+  NETWORK_STATE_ONLINE = 2;
+}
+
+enum SyncPowerState {
+  POWER_STATE_AUTO = 0;
+  POWER_STATE_AVOID_DRAINING = 1;
+}
+
 message BackgroundSyncRegistrationProto {
   required int64 id = 1;
   required string name = 2;
-  optional int64 min_period = 3;
+  required bool fire_once = 3;
+  required int64 min_period = 4;
+  required SyncNetworkState network_state = 5;
+  required SyncPowerState power_state = 6;
 }
 
 message BackgroundSyncRegistrationsProto {
   repeated BackgroundSyncRegistrationProto registration = 1;
   required int64 next_registration_id = 2;
 }