[ServiceWorker] Added size deltas and total size computation for QuotaM.

content/public/browser/service_worker_usage_info.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_SERVICE_WORKER_USAGE_INFO_H_
 #define CONTENT_PUBLIC_BROWSER_SERVICE_WORKER_USAGE_INFO_H_
 
 #include <vector>
 
 #include "content/common/content_export.h"
 #include "url/gurl.h"
 
 namespace content {
 
 // Used to report per-origin storage info for registered Service Workers.
 class CONTENT_EXPORT ServiceWorkerUsageInfo {
  public:
   ServiceWorkerUsageInfo(const GURL& origin, const std::vector<GURL>& scopes);
   ServiceWorkerUsageInfo(const GURL& origin);
   ServiceWorkerUsageInfo();
   ~ServiceWorkerUsageInfo();
 
   // The origin this object is describing.
   GURL origin;
 
   // The set of all Service Worker registrations within this origin;
   // a registration is a 'scope' - a URL with optional wildcard.
   std::vector<GURL> scopes;
 
-  // TODO(jsbell): Add size on disk (in bytes).
+  // The total size, including resources.
+  int64 total_size_bytes;
+
   // TODO(jsbell): Add last modified time.
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_SERVICE_WORKER_USAGE_INFO_H_