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

content/public/browser/service_worker_usage_info.h

Index: content/public/browser/service_worker_usage_info.h
diff --git a/content/public/browser/service_worker_usage_info.h b/content/public/browser/service_worker_usage_info.h
index bfd6fc579bbd7d8c6a79705bb04697173a7fc713..d0424595ddf506706b30e810f83df6ddf0bf424b 100644
--- a/content/public/browser/service_worker_usage_info.h
+++ b/content/public/browser/service_worker_usage_info.h
@@ -27,7 +27,9 @@ class CONTENT_EXPORT ServiceWorkerUsageInfo {
   // 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.
 };