redesign and reimplement proxy config service and tracker, revise proxy ui on cros

chrome/browser/prefs/proxy_prefs.h

 // 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>
 
@@ skipping 18 matching lines @@
   // Use the settings specified in kProxyServer and kProxyBypassList.
   MODE_FIXED_SERVERS = 3,
 
   // The system's proxy settings are used, other proxy preferences are
   // ignored.
   MODE_SYSTEM = 4,
 
   kModeCount
 };
 
+// State of proxy configuration.
+enum ConfigState {
+  // Configuration is from policy.
+  CONFIG_POLICY,
+  // Configuration is from extension.
+  CONFIG_EXTENSION,
+  // Configuration is not from policy or extension but still precedes others.
+  CONFIG_OTHER_PRECEDE,
+  // Configuration is from sytem.
+  CONFIG_SYSTEM,
+  // Configuration is recommended i.e there's a fallback configuration.
+  CONFIG_FALLBACK,
+  // Configuration is known to be not set.
+  CONFIG_UNSET,
+};
+
 // Constants for string values used to specify the proxy mode through externally
 // visible APIs, e.g. through policy or the proxy extension API.
 extern const char kDirectProxyModeName[];
 extern const char kAutoDetectProxyModeName[];
 extern const char kPacScriptProxyModeName[];
 extern const char kFixedServersProxyModeName[];
 extern const char kSystemProxyModeName[];
 
 bool IntToProxyMode(int in_value, ProxyMode* out_value);
 bool StringToProxyMode(const std::string& in_value,
                        ProxyMode* out_value);
 // Ownership of the return value is NOT passed to the caller.
 const char* ProxyModeToString(ProxyMode mode);
 
+bool DoesPrefPrecede(ConfigState config_state);
+
 }  // namespace ProxyPrefs
 
 #endif  // CHROME_BROWSER_PREFS_PROXY_PREFS_H_