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 155282)
+++ net/http/http_cache.h	(working copy)
@@ -31,6 +31,7 @@
 #include "net/base/load_states.h"
 #include "net/base/net_export.h"
 #include "net/http/http_transaction_factory.h"
+#include "net/http/infinite_cache.h"
 
 class GURL;
 
@@ -190,6 +191,9 @@
   // referred to by |url| and |http_method|.
   void OnExternalCacheHit(const GURL& url, const std::string& http_method);
 
+  // Initializes the Infinite Cache, if selected by the field trial.
+  void InitializeInfiniteCache(const FilePath& path);
+
   // HttpTransactionFactory implementation:
   virtual int CreateTransaction(scoped_ptr<HttpTransaction>* trans,
                                 HttpTransactionDelegate* delegate) OVERRIDE;
@@ -215,6 +219,7 @@
   class Transaction;
   class WorkItem;
   friend class Transaction;
+  friend class InfiniteCache;
   struct PendingOp;  // Info for an entry under construction.
 
   typedef std::list<Transaction*> TransactionList;
@@ -393,6 +398,8 @@
 
   scoped_ptr<PlaybackCacheMap> playback_cache_map_;
 
+  InfiniteCache infinite_cache_;
+
   DISALLOW_COPY_AND_ASSIGN(HttpCache);
 };