Track sources of proxy settings.

net/proxy/proxy_config_service_linux.h

 // 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.
 
 #ifndef NET_PROXY_PROXY_CONFIG_SERVICE_LINUX_H_
 #define NET_PROXY_PROXY_CONFIG_SERVICE_LINUX_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 50 matching lines @@
 
     // Requests notification of gconf/gsettings changes for proxy
     // settings. Returns true on success.
     virtual bool SetUpNotifications(Delegate* delegate) = 0;
 
     // Returns the message loop for the thread on which this object
     // handles notifications, and also on which it must be destroyed.
     // Returns NULL if it does not matter.
     virtual base::SingleThreadTaskRunner* GetNotificationTaskRunner() = 0;
 
-    // Returns the data source's name (e.g. "gconf", "gsettings", "KDE",
-    // "test"). Used only for diagnostic purposes (e.g. VLOG(1) etc.).
-    virtual const char* GetDataSource() = 0;
+    // Returns the source of proxy settings.
+    virtual ProxyConfigSource GetConfigSource() = 0;
 
     // These are all the values that can be fetched. We used to just use the
     // corresponding paths in gconf for these, but gconf is now obsolete and
     // in the future we'll be using mostly gsettings/kioslaverc so we
     // enumerate them instead to avoid unnecessary string operations.
     enum StringSetting {
       PROXY_MODE,
       PROXY_AUTOCONF_URL,
       PROXY_HTTP_HOST,
       PROXY_HTTPS_HOST,
@@ skipping 218 matching lines @@
 
  private:
   scoped_refptr<Delegate> delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyConfigServiceLinux);
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_CONFIG_SERVICE_LINUX_H_