Update about:cache to display cached metadata for an entry....

net/http/http_cache.h

Index: net/http/http_cache.h
===================================================================
--- net/http/http_cache.h	(revision 44299)
+++ net/http/http_cache.h	(working copy)
@@ -28,6 +28,7 @@
 #include "net/http/http_transaction_factory.h"
 
 class GURL;
+class ViewCacheHelper;
 
 namespace disk_cache {
 class Backend;
@@ -158,6 +159,18 @@
     enable_range_support_ = value;
   }
 
+ protected:
+  // Disk cache entry data indices.
+  enum {
+    kResponseInfoIndex = 0,
+    kResponseContentIndex,
+    kMetadataIndex,
+
+    // Must remain at the end of the enum.
+    kNumCacheEntryDataIndices
+  };
+  friend class ::ViewCacheHelper;
+
  private:
 
   // Types --------------------------------------------------------------------