Track sources of proxy settings.

net/proxy/proxy_config_source.cc

+// Copyright (c) 2012 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/proxy/proxy_config_source.h"
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+
+namespace net {
+
+namespace {
+
+const char* kSourceNames[] = {
+  "UNKNOWN",
+  "SYSTEM",
+  "SYSTEM FAILED",
+  "GCONF",
+  "GSETTINGS",
+  "KDE",
+  "ENV",
+  "CUSTOM",
+  "TEST"
+};
+COMPILE_ASSERT(ARRAYSIZE_UNSAFE(kSourceNames) == NUM_PROXY_CONFIG_SOURCES,
+               source_names_incorrect_size);
+
+}  // namespace
+
+const char* ProxyConfigSourceToString(ProxyConfigSource source) {
+  DCHECK_GT(NUM_PROXY_CONFIG_SOURCES, source);
+  return kSourceNames[source];
+}
+
+}  // namespace net