[CUPS] Implement the enterprise icon for printers in Print Preview Dialog.

printing/backend/print_backend_consts.cc

Index: printing/backend/print_backend_consts.cc
diff --git a/printing/backend/print_backend_consts.cc b/printing/backend/print_backend_consts.cc
index 1717a464738e08799afaa5c43f6ab65c0c4178fe..34b6a7e22e819ff64da27a8deda31f1f7d0f3c51 100644
--- a/printing/backend/print_backend_consts.cc
+++ b/printing/backend/print_backend_consts.cc
@@ -8,6 +8,7 @@
 
 const char kCUPSBlocking[] = "cups_blocking";
 const char kCUPSEncryption[] = "cups_encryption";
+const char kCUPSEnterprisePrinter[] = "cupsEnterprisePrinter";
 const char kCUPSPrintServerURL[] = "print_server_url";
 const char kDriverInfoTagName[] = "system_driverinfo";
 const char kDriverNameTagName[] = "printer-make-and-model";  // Match CUPS.