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

chrome/browser/prefs/proxy_prefs.h

Index: chrome/browser/prefs/proxy_prefs.h
===================================================================
--- chrome/browser/prefs/proxy_prefs.h	(revision 106059)
+++ chrome/browser/prefs/proxy_prefs.h	(working copy)
@@ -36,6 +36,22 @@
   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[];
@@ -50,6 +66,8 @@
 // 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_