Allow automatic use of stale cache entries if site is unreachable.

net/http/http_cache_transaction.h

Index: net/http/http_cache_transaction.h
diff --git a/net/http/http_cache_transaction.h b/net/http/http_cache_transaction.h
index bd5a46fa86e4913dc67523c361926af9b7d05d0f..785b4b78e69b639b1d1ba4f17b1056a9a6ba2662 100644
--- a/net/http/http_cache_transaction.h
+++ b/net/http/http_cache_transaction.h
@@ -9,6 +9,7 @@
 #define NET_HTTP_HTTP_CACHE_TRANSACTION_H_
 
 #include <string>
+#include <vector>
 
 #include "base/time.h"
 #include "net/base/completion_callback.h"
@@ -379,6 +380,10 @@ class HttpCache::Transaction : public HttpTransaction {
   void RunDelayedLoop(base::TimeTicks delay_start_time,
                       base::TimeDelta intended_delay, int result);
 
+#if !defined(NDEBUG)
+  void DumpStatePath();
+#endif
+
   State next_state_;
   const HttpRequestInfo* request_;
   BoundNetLog net_log_;
@@ -408,6 +413,7 @@ class HttpCache::Transaction : public HttpTransaction {
   bool cache_pending_;  // We are waiting for the HttpCache.
   bool done_reading_;
   bool vary_mismatch_;  // The request doesn't match the stored vary data.
+  bool couldnt_conditionalize_request_;
   scoped_refptr<IOBuffer> read_buf_;
   int io_buf_len_;
   int read_offset_;
@@ -442,6 +448,11 @@ class HttpCache::Transaction : public HttpTransaction {
   int sensitivity_analysis_percent_increase_;
 
   HttpTransactionDelegate* transaction_delegate_;
+
+#if !defined(NDEBUG)
+  // Record of all states this transaction has moved through.
+  std::vector<int> state_path_;
+#endif
 };
 
 }  // namespace net