Add a declarative way in c/b/s/sync_prefs.cc to say which data types have prefs

chrome/browser/sync/sync_prefs.h

 // Copyright (c) 2011 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_SYNC_SYNC_PREFS_H_
 #define CHROME_BROWSER_SYNC_SYNC_PREFS_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 100 matching lines @@
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // For testing.
 
   void SetManagedForTest(bool is_managed);
   syncable::ModelTypeSet GetAcknowledgeSyncedTypesForTest() const;
 
  private:
+  void RegisterDependentTypes();

[akalin, 2012/03/01 07:40:59]

I guess this'll be RegisterPrefGroups

[not at google - send to devlin, 2012/03/01 23:39:36]

Done.

   void RegisterPreferences();
 
   void RegisterDataTypePreferredPref(
       syncable::ModelType type, bool is_preferred);
   bool GetDataTypePreferred(syncable::ModelType type) const;
   void SetDataTypePreferred(syncable::ModelType type, bool is_preferred);
 
+  // Returns a ModelTypeSet based on |types| augmented with any dependent types

[akalin, 2012/03/01 07:40:59]

augmented with any dependent types ... ->
expanded to include pref groups (see |pref_groups_|

[not at google - send to devlin, 2012/03/01 23:39:36]

Done.

+  // (see |dependent_types_|), but as a subset of |registered_types|.
+  syncable::ModelTypeSet ResolveDependentTypes(
+      const syncable::ModelTypeSet& registered_types,
+      const syncable::ModelTypeSet& types) const;
+
   base::NonThreadSafe non_thread_safe_;
 
   // May be NULL.
   PrefService* const pref_service_;
 
   ObserverList<SyncPrefObserver> sync_pref_observers_;
 
   // The preference that controls whether sync is under control by
   // configuration management.
   BooleanPrefMember pref_sync_managed_;
 
+  // Data types where the enable/disabled preference is dependent on another
+  // type, such APP_NOTIFICATIONS on APPS. This is map from dependent type
+  // (APP_NOTIFICATIONS) -> type depended on (APPS).
+  typedef std::map<syncable::ModelType, syncable::ModelType>
+      DependentTypesMap;
+  DependentTypesMap dependent_types_;
+
   DISALLOW_COPY_AND_ASSIGN(SyncPrefs);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_SYNC_PREFS_H_