Add daily quota for precache

components/precache/core/proto/precache.proto

 // Copyright 2013 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";
 
 package precache;
 
 // Chrome requires this.
 option optimize_for = LITE_RUNTIME;
@@ skipping 66 matching lines @@
   // The maximum number of bytes to download per resource. Downloads of
   // resources larger than this will be cancelled. This max applies only to new
   // downloads; cached resources are not capped.
   optional uint64 max_bytes_per_resource = 4 [default = 500000 /* 500 KB */];
 
   // The maximum number of bytes per precache run. While precaching, the total
   // number of bytes used for resources is tallied -- this includes new
   // downloads as well as cached resources. After this limit is reached, no
   // other resources will be downloaded.
   optional uint64 max_bytes_total = 5 [default = 10000000 /* 10 MB */];
+
+  // The maximum number of bytes that can be fetched by precache on a single
+  // day. After this limit is reached, no more resources will be downloaded,
+  // until the quota gets replenished the next day.
+  optional uint64 daily_quota_total = 6 [default = 10000000 /* 10 MB */];
 };