Introduce a separate preference for 'proxy server mode'

chrome/browser/prefs/proxy_prefs.h

Index: chrome/browser/prefs/proxy_prefs.h
diff --git a/chrome/browser/prefs/proxy_prefs.h b/chrome/browser/prefs/proxy_prefs.h
new file mode 100644
index 0000000000000000000000000000000000000000..a7bf2ec1477e36ff6e06f5568e9e6f196c4060c3
--- /dev/null
+++ b/chrome/browser/prefs/proxy_prefs.h
@@ -0,0 +1,46 @@
+// 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.
+
+#ifndef CHROME_BROWSER_PREFS_PROXY_PREFS_H_
+#define CHROME_BROWSER_PREFS_PROXY_PREFS_H_
+#pragma once
+
+#include <string>
+
+namespace ProxyPrefs {
+  // Possible types of specifying proxy settings. Do not change the order of
+  // the constants, because numeric values are exposed to users.
+  // If you add an enum constant, you should also add a string to
+  // kProxyModeNames in the .cc file.
+  // Note that these constants serve for the internal representation in pref
+  // stores. Proxy policies use a different representation, see
+  // configuration_policy_store_interface.h.
+  enum ProxyMode {
+    // Direct connection to the network, other proxy preferences are ignored.
+    DISABLED = 0,
+
+    // Try to retrieve a PAC script from http://wpad/wpad.dat or fall back to
+    // direct connection.
+    AUTO_DETECT = 1,
+
+    // Try to retrieve a PAC script from kProxyPacURL or fall back to direct
+    // connection.
+    PAC_SCRIPT = 2,
+
+    // Use the settings specified in kProxyServer and kProxyBypassList.
+    FIXED_SERVERS = 3,
+
+    // The system's proxy settings are used, other proxy preferences are
+    // ignored.
+    SYSTEM = 4,
+
+    NUM_MODES
+  };
+
+  bool IntToProxyMode(int in_value, ProxyMode* out_value);
+  bool StringToProxyMode(const std::string& in_value,
+                         ProxyMode* out_value);
+};
+
+#endif  // CHROME_BROWSER_PREFS_PROXY_PREFS_H_