First pass at adding http/backend cache to NetLog

net/http/http_cache.h

Index: net/http/http_cache.h
===================================================================
--- net/http/http_cache.h	(revision 68857)
+++ net/http/http_cache.h	(working copy)
@@ -86,7 +86,8 @@
     // notification arrives.
     // The implementation must not access the factory object after invoking the
     // |callback| because the object can be deleted from within the callback.
-    virtual int CreateBackend(disk_cache::Backend** backend,
+    virtual int CreateBackend(NetLog* net_log,
+                              disk_cache::Backend** backend,
                               CompletionCallback* callback) = 0;
   };
 
@@ -104,7 +105,8 @@
     static BackendFactory* InMemory(int max_bytes);
 
     // BackendFactory implementation.
-    virtual int CreateBackend(disk_cache::Backend** backend,
+    virtual int CreateBackend(NetLog* net_log,
+                              disk_cache::Backend** backend,
                               CompletionCallback* callback);
 
    private:
@@ -138,6 +140,7 @@
   // by the HttpCache and will be destroyed using |delete| when the HttpCache is
   // destroyed.
   HttpCache(HttpTransactionFactory* network_layer,
+            NetLog* net_log,
             BackendFactory* backend_factory);
 
   HttpTransactionFactory* network_layer() { return network_layer_.get(); }
@@ -213,7 +216,7 @@
     bool               will_process_pending_queue;
     bool               doomed;
 
-    explicit ActiveEntry(disk_cache::Entry*);
+    explicit ActiveEntry(disk_cache::Entry* entry);
     ~ActiveEntry();
   };
 
@@ -342,6 +345,8 @@
 
   // Variables ----------------------------------------------------------------
 
+  NetLog* net_log_;
+
   // Used when lazily constructing the disk_cache_.
   scoped_ptr<BackendFactory> backend_factory_;
   bool building_backend_;