Intorduce a separate preference for 'proxy server mode'

chrome/browser/prefs/proxy_prefs.cc

+// Copyright (c) 2010 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 "chrome/browser/prefs/proxy_prefs.h"
+
+#include "base/logging.h"
+
+// static
+bool ProxyPrefs::IntToMode(
+    int in_value,
+    ProxyPrefs::ProxyServerMode* out_value) {
+  DCHECK(out_value);
+  if (in_value == ProxyPrefs::DISABLED) {
+    *out_value = ProxyPrefs::DISABLED;
+    return true;
+  } else if (in_value == ProxyPrefs::SYSTEM) {
+    *out_value = ProxyPrefs::SYSTEM;
+    return true;
+  } else if (in_value == ProxyPrefs::AUTO_DETECT) {
+    *out_value = ProxyPrefs::AUTO_DETECT;
+    return true;
+  } else if (in_value == ProxyPrefs::MANUAL) {
+    *out_value = ProxyPrefs::MANUAL;
+    return true;
+  } else {
+    return false;
+  }
+}
+
+// static
+bool ProxyPrefs::StringToMode(
+    const std::string& in_value,
+    ProxyPrefs::ProxyServerMode* out_value) {
+  DCHECK(out_value);
+  if (in_value == "disable") {
+    *out_value = ProxyPrefs::DISABLED;
+    return true;
+  } else if (in_value == "system") {
+    *out_value = ProxyPrefs::SYSTEM;
+    return true;
+  } else if (in_value == "auto_detect") {
+    *out_value = ProxyPrefs::AUTO_DETECT;
+    return true;
+  } else if (in_value == "manual") {
+    *out_value = ProxyPrefs::MANUAL;
+    return true;
+  } else {
+    return false;
+  }
+}