Implement 'Do Not Track' header

chrome/browser/net/chrome_network_delegate.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 CHROME_BROWSER_NET_CHROME_NETWORK_DELEGATE_H_
 #define CHROME_BROWSER_NET_CHROME_NETWORK_DELEGATE_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
@@ skipping 18 matching lines @@
 namespace policy {
 class URLBlacklistManager;
 }
 
 // ChromeNetworkDelegate is the central point from within the chrome code to
 // add hooks into the network stack.
 class ChromeNetworkDelegate : public net::NetworkDelegate {
  public:
   // If |profile| is NULL, events will be broadcasted to all profiles,
   // otherwise they will only be sent to the specified profile.
-  // |enable_referrers| should be initialized on the UI thread (see below)
-  // beforehand. This object's owner is responsible for cleaning it up at
-  // shutdown. If |cookie_settings| is NULL, all cookies are enabled,
-  // otherwise, the settings are enforced on all observed network requests.
+  // |enable_referrers| and |enable_do_not_track| should be initialized on the
+  // UI thread (see below) beforehand. This object's owner is responsible for
+  // cleaning it up at shutdown. |enable_do_not_track| can be NULL.
+  // If |cookie_settings| is NULL, all cookies are enabled, otherwise, the
+  // settings are enforced on all observed network requests.
   ChromeNetworkDelegate(
       extensions::EventRouterForwarder* event_router,
       ExtensionInfoMap* extension_info_map,
       const policy::URLBlacklistManager* url_blacklist_manager,
       const ManagedModeURLFilter* managed_mode_url_filter,
       void* profile,
       CookieSettings* cookie_settings,
       BooleanPrefMember* enable_referrers,
+      BooleanPrefMember* enable_do_not_track,
       chrome_browser_net::LoadTimeStats* load_time_stats);
   virtual ~ChromeNetworkDelegate();
 
   // Causes |OnCanThrottleRequest| to always return false, for all
   // instances of this object.
   static void NeverThrottleRequests();
 
-  // Binds |enable_referrers| to |pref_service| and moves it to the IO thread.
+  // Binds the pref members to |pref_service| and moves them to the IO thread.
+  // |enable_do_not_track| can be NULL.
   // This method should be called on the UI thread.
-  static void InitializeReferrersEnabled(BooleanPrefMember* enable_referrers,
-                                         PrefService* pref_service);
+  static void InitializePrefsOnUIThread(BooleanPrefMember* enable_referrers,
+                                        BooleanPrefMember* enable_do_not_track,
+                                        PrefService* pref_service);
 
   // When called, all file:// URLs will now be accessible.  If this is not
   // called, then some platforms restrict access to file:// paths.
   static void AllowAccessToAllFiles();
 
  private:
   friend class ChromeNetworkDelegateTest;
 
   // NetworkDelegate implementation.
   virtual int OnBeforeURLRequest(net::URLRequest* request,
@@ skipping 40 matching lines @@
                                         RequestWaitState state) OVERRIDE;
 
   scoped_refptr<extensions::EventRouterForwarder> event_router_;
   void* profile_;
   scoped_refptr<CookieSettings> cookie_settings_;
 
   scoped_refptr<ExtensionInfoMap> extension_info_map_;
 
   // Weak, owned by our owner.
   BooleanPrefMember* enable_referrers_;
+  BooleanPrefMember* enable_do_not_track_;
 
   // Weak, owned by our owner.
   const policy::URLBlacklistManager* url_blacklist_manager_;
 
   // Weak pointer. The owner of this object needs to make sure that the
   // |managed_mode_url_filter_| outlives it.
   const ManagedModeURLFilter* managed_mode_url_filter_;
 
   // When true, allow access to all file:// URLs.
   static bool g_allow_file_access_;
 
   // True if OnCanThrottleRequest should always return false.
   //
   // Note: This needs to be static as the instance of
   // ChromeNetworkDelegate used may change over time, and we need to
   // set this variable once at start-up time.  It is effectively
   // static anyway since it is based on a command-line flag.
   static bool g_never_throttle_requests_;
 
   // Pointer to IOThread global, should outlive ChromeNetworkDelegate.
   chrome_browser_net::LoadTimeStats* load_time_stats_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeNetworkDelegate);
 };
 
 #endif  // CHROME_BROWSER_NET_CHROME_NETWORK_DELEGATE_H_