Http Cache: Add code for simulating an infinite HTTP cache.

net/http/http_cache.h

Index: net/http/http_cache.h
===================================================================
--- net/http/http_cache.h	(revision 156633)
+++ net/http/http_cache.h	(working copy)
@@ -32,6 +32,7 @@
 #include "net/base/net_export.h"
 #include "net/http/http_network_session.h"
 #include "net/http/http_transaction_factory.h"
+#include "net/http/infinite_cache.h"
 
 class GURL;
 
@@ -208,6 +209,7 @@
   class Transaction;
   class WorkItem;
   friend class Transaction;
+  friend class InfiniteCache;
   struct PendingOp;  // Info for an entry under construction.
 
   typedef std::list<Transaction*> TransactionList;
@@ -386,6 +388,8 @@
 
   scoped_ptr<PlaybackCacheMap> playback_cache_map_;
 
+  InfiniteCache infinite_cache_;
+
   DISALLOW_COPY_AND_ASSIGN(HttpCache);
 };