Distinguish between old and new FTP LIST response parsers

net/ftp/ftp_server_type_histograms.h

Index: net/ftp/ftp_server_type_histograms.h
diff --git a/net/ftp/ftp_server_type_histograms.h b/net/ftp/ftp_server_type_histograms.h
index 08ca4240c562aec940be4b89621bd80aad4f1c5b..fef9bb2b94134a3fe982a22c03c45973e600792e 100644
--- a/net/ftp/ftp_server_type_histograms.h
+++ b/net/ftp/ftp_server_type_histograms.h
@@ -19,14 +19,22 @@ enum FtpServerType {
   // connecting to isn't an FTP server), or a broken server.
   SERVER_UNKNOWN = 0,
 
-  SERVER_LSL = 1,   // Server using /bin/ls -l and variants.
-  SERVER_DLS = 2,   // Server using /bin/dls.
-  SERVER_EPLF = 3,  // Server using EPLF format.
-  SERVER_DOS = 4,   // WinNT server configured for old style listing.
-  SERVER_VMS = 5,   // VMS (including variants).
-  SERVER_CMS = 6,   // IBM VM/CMS, VM/ESA, z/VM formats.
-  SERVER_OS2 = 7,   // OS/2 FTP Server.
-  SERVER_W16 = 8,   // win16 hosts: SuperTCP or NetManage Chameleon.
+  // The types below are recognized by ParseFTPList code from Mozilla. If we hit
+  // one of these, it means that our new LIST parser failed for that server.
+  SERVER_MOZ_LSL = 1,   // Server using /bin/ls -l and variants.
+  SERVER_MOZ_DLS = 2,   // Server using /bin/dls.
+  SERVER_MOZ_EPLF = 3,  // Server using EPLF format.
+  SERVER_MOZ_DOS = 4,   // WinNT server configured for old style listing.
+  SERVER_MOZ_VMS = 5,   // VMS (including variants).
+  SERVER_MOZ_CMS = 6,   // IBM VM/CMS, VM/ESA, z/VM formats.
+  SERVER_MOZ_OS2 = 7,   // OS/2 FTP Server.
+  SERVER_MOZ_W16 = 8,   // win16 hosts: SuperTCP or NetManage Chameleon.
+
+  // The types below are recognized by our new LIST parser. If we hit one of
+  // these, it means that it's working quite well.
+  SERVER_LS = 9,        // Server using /bin/ls -l listing style.
+  SERVER_WINDOWS = 10,  // Server using Windows listing style.
+  SERVER_VMS = 11,      // Server using VMS listing style.
 
   NUM_OF_SERVER_TYPES
 };