Add GetExpirationTimes() to HttpResponseHeader.

net/http/http_cache_transaction.h

 // Copyright (c) 2012 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.
 
 // This file declares HttpCache::Transaction, a private class of HttpCache so
 // it should only be included by http_cache.cc
 
 #ifndef NET_HTTP_HTTP_CACHE_TRANSACTION_H_
 #define NET_HTTP_HTTP_CACHE_TRANSACTION_H_
 
@@ skipping 28 matching lines @@
 
 class PartialData;
 struct HttpRequestInfo;
 struct LoadTimingInfo;
 class SSLPrivateKey;
 
 // This is the transaction that is returned by the HttpCache transaction
 // factory.
 class HttpCache::Transaction : public HttpTransaction {
  public:
+  // Used for |RequiresValidation()|.
+  enum class ValidationType {
+    NONE,          // The resource is fresh.
+    ASYNCHRONOUS,  // The resource requires async revalidation.
+    SYNCHRONOUS,   // The resource requires sync revalidation.
+  };
+
   // The transaction has the following modes, which apply to how it may access
   // its cache entry.
   //
   //  o If the mode of the transaction is NONE, then it is in "pass through"
   //    mode and all methods just forward to the inner network transaction.
   //
   //  o If the mode of the transaction is only READ, then it may only read from
   //    the cache entry.
   //
   //  o If the mode of the transaction is only WRITE, then it may only write to
@@ skipping 435 matching lines @@
   BeforeProxyHeadersSentCallback before_proxy_headers_sent_callback_;
 
   base::WeakPtrFactory<Transaction> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Transaction);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_CACHE_TRANSACTION_H_