Hide "New incognito window" from jump list if disabled by policy.

chrome/browser/jumplist_win.h

Index: chrome/browser/jumplist_win.h
diff --git a/chrome/browser/jumplist_win.h b/chrome/browser/jumplist_win.h
index 30739d68fbd23aa37394e2e7f1ecd0647839fae6..41b12a939285b2555e617f208d2b022610defd44 100644
--- a/chrome/browser/jumplist_win.h
+++ b/chrome/browser/jumplist_win.h
@@ -17,6 +17,7 @@
 #include "chrome/browser/history/history_service.h"
 #include "chrome/browser/history/history_types.h"
 #include "chrome/browser/jumplist_updater_win.h"
+#include "chrome/browser/prefs/incognito_mode_prefs.h"
 #include "chrome/browser/sessions/tab_restore_service.h"
 #include "chrome/browser/sessions/tab_restore_service_observer.h"
 #include "content/public/browser/browser_thread.h"
@@ -29,20 +30,20 @@ namespace content {
 class NotificationRegistrar;
 }
 
-class Profile;
 class PageUsageData;
+class PrefChangeRegistrar;
+class Profile;
 
 // A class which implements an application JumpList.
 // This class encapsulates operations required for updating an application
 // JumpList:
 // * Retrieving "Most Visited" pages from HistoryService;
 // * Retrieving strings from the application resource;
-// * Creatng COM objects used by JumpList from PageUsageData objects;
+// * Creating COM objects used by JumpList from PageUsageData objects;
 // * Adding COM objects to JumpList, etc.
 //
-// This class also implements TabRestoreServiceObserver. So, once we call
-// AddObserver() and register this class as an observer, it automatically
-// updates a JumpList when a tab is added or removed.
+// This class observes the tabs and policies of the given Profile and updates
+// the JumpList whenever a change is detected.
 //
 // Updating a JumpList requires some file operations and it is not good to
 // update it in a UI thread. To solve this problem, this class posts to a
@@ -55,19 +56,13 @@ class JumpList : public TabRestoreServiceObserver,
                  public base::RefCountedThreadSafe<
                      JumpList, content::BrowserThread::DeleteOnUIThread> {
  public:
-  JumpList();
+  explicit JumpList(Profile* profile);
 
   // NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details);
 
-  // Registers (or unregisters) this object as an observer.
-  // When the TabRestoreService object notifies the tab status is changed, this
-  // class automatically updates an application JumpList.
-  bool AddObserver(Profile* profile);
-  void RemoveObserver();
-
   // Observer callback for TabRestoreService::Observer to notify when a tab is
   // added or removed.
   virtual void TabRestoreServiceChanged(TabRestoreService* service);
@@ -79,16 +74,21 @@ class JumpList : public TabRestoreServiceObserver,
   // Cancel a pending jumplist update.
   void CancelPendingUpdate();
 
-  // Terminate the jumplist: cancel any pending updates and remove observer
-  // from TabRestoreService. This must be called before the profile provided
-  // in the AddObserver method is destroyed.
+  // Terminate the jumplist: cancel any pending updates and stop observing
+  // the Profile and its services. This must be called before the |profile_|
+  // is destroyed.
   void Terminate();
 
   // Returns true if the custom JumpList is enabled.
   // The custom jumplist works only on Windows 7 and above.
   static bool Enabled();
 
- protected:
+ private:
+  friend struct content::BrowserThread::DeleteOnThread<
+      content::BrowserThread::UI>;
+  friend class base::DeleteHelper<JumpList>;
+  virtual ~JumpList();
+
   // Creates a ShellLinkItem object from a tab (or a window) and add it to the
   // given list.
   // These functions are copied from the RecentlyClosedTabsHandler class for
@@ -120,20 +120,20 @@ class JumpList : public TabRestoreServiceObserver,
   void OnMostVisitedURLsAvailable(
       const history::MostVisitedURLList& data);
 
+  // Callback for changes to the incognito mode availability pref.
+  void OnIncognitoAvailabilityChanged();
+
+  // Helper for RunUpdate() that determines its parameters.
+  void PostRunUpdate();
+
   // Runnable method that updates the jumplist, once all the data
   // has been fetched.
-  void RunUpdate();
+  void RunUpdate(IncognitoModePrefs::Availability incognito_availability);
 
   // Helper method for RunUpdate to create icon files for the asynchrounously
   // loaded icons.
   void CreateIconFiles(const ShellLinkItemList& item_list);
 
- private:
-  friend struct content::BrowserThread::DeleteOnThread<
-      content::BrowserThread::UI>;
-  friend class base::DeleteHelper<JumpList>;
-  ~JumpList();
-
   // For callbacks may be run after destruction.
   base::WeakPtrFactory<JumpList> weak_ptr_factory_;
 
@@ -145,6 +145,7 @@ class JumpList : public TabRestoreServiceObserver,
 
   // Lives on the UI thread.
   scoped_ptr<content::NotificationRegistrar> registrar_;
+  scoped_ptr<PrefChangeRegistrar> pref_change_registrar_;
 
   // App id to associate with the jump list.
   std::wstring app_id_;