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

chrome/browser/sync/sync_prefs.h

Index: chrome/browser/sync/sync_prefs.h
diff --git a/chrome/browser/sync/sync_prefs.h b/chrome/browser/sync/sync_prefs.h
index bb67b1c3812c26210a06d427d25519a84bcbf862..021a065ed81e2eef5ce5fbee3b883f9eb96d8464 100644
--- a/chrome/browser/sync/sync_prefs.h
+++ b/chrome/browser/sync/sync_prefs.h
@@ -118,6 +118,7 @@ class SyncPrefs : public base::SupportsWeakPtr<SyncPrefs>,
   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(
@@ -125,6 +126,12 @@ class SyncPrefs : public base::SupportsWeakPtr<SyncPrefs>,
   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.
@@ -136,6 +143,13 @@ class SyncPrefs : public base::SupportsWeakPtr<SyncPrefs>,
   // 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);
 };