Add metrics for DHCP WPAD feature.

net/base/net_errors.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/base/net_errors.h"
 
 #include "base/basictypes.h"
 #include "base/stringize_macros.h"
 
 namespace net {
 
 const char kErrorDomain[] = "net";
 
 const char* ErrorToString(int error) {
   if (error == 0)
     return "net::OK";
 
   switch (error) {
 #define NET_ERROR(label, value) \
   case ERR_ ## label: \
     return "net::" STRINGIZE_NO_EXPANSION(ERR_ ## label);
 #include "net/base/net_error_list.h"
 #undef NET_ERROR
   default:
     return "net::<unknown>";
   }
 }
 
+std::vector<int> GetAllErrorCodesForUma() {
+  std::vector<int> all_error_codes;
+#define NET_ERROR(label, value) all_error_codes.push_back(-(value));

[jar (doing other things), 2011/05/19 23:25:38]

Although this was copied....  it might be better to push two cutoffs per error
code, so that IF there is an intermediate value, it is not accidentally lumped
with the previous bucket.  Note that the underlying HISTOGRAM will get rid of
dups, so you don't need to worry about that eventuality.  The code might then
look like:

#define NET_ERROR(laber, value) all_error_codes.push_back(-(value)) ; \
all_error_codes.push_back(1 - (value));

IF you do make this change, you may want to rename any existing users of this
list so that they don't conflate the existing uploads (though you can always
split them out by version).

+#include "net/base/net_error_list.h"
+#undef NET_ERROR
+  return all_error_codes;
+}
+
 }  // namespace net