Http cache: Measure back navigations on the infinite cache simulation.

net/http/infinite_cache.h

Index: net/http/infinite_cache.h
===================================================================
--- net/http/infinite_cache.h	(revision 163902)
+++ net/http/infinite_cache.h	(working copy)
@@ -43,6 +43,9 @@
   // Called when a new HttpTransaction is started.
   void OnRequestStart(const HttpRequestInfo* request);
 
+  // Called when the transaction corresponds to a back navigation.
+  void OnBackNavigation();

[gavinp, 2012/10/25 18:25:47]

Nit: say either History navigation or BackForward here.

[rvargas (doing something else), 2012/10/25 18:32:18]

Done.

+
   // Called when the response headers are available.
   void OnResponseReceived(const HttpResponseInfo* response);