HttpCache::Transaction layer allowing parallel validation

net/http/http_transaction_test_util.h

Index: net/http/http_transaction_test_util.h
diff --git a/net/http/http_transaction_test_util.h b/net/http/http_transaction_test_util.h
index e936ac9de01d745783c1f2981d98f55df3a60664..99aeaa6b64e10a48ada3f7dfb1b0ef36257071f1 100644
--- a/net/http/http_transaction_test_util.h
+++ b/net/http/http_transaction_test_util.h
@@ -244,6 +244,8 @@ class MockNetworkTransaction
   RequestPriority priority() const { return priority_; }
   const HttpRequestInfo* request() const { return request_; }
 
+  static void DeferNetworkStart(bool* defer);
+
   // Bogus value that will be returned by GetTotalReceivedBytes() if the
   // MockNetworkTransaction was started.
   static const int64_t kTotalReceivedBytes;
@@ -280,6 +282,8 @@ class MockNetworkTransaction
 
   bool done_reading_called_;
 
+  CompletionCallback callback_;  // used for pause and restart.
+
   base::WeakPtrFactory<MockNetworkTransaction> weak_factory_;
 
 };