sync: Implementation of Priority Preferences.

chrome/browser/prefs/pref_registry_syncable.h

Index: chrome/browser/prefs/pref_registry_syncable.h
diff --git a/chrome/browser/prefs/pref_registry_syncable.h b/chrome/browser/prefs/pref_registry_syncable.h
index d6d1a4ae0e3da60325696076b0b224ccaaeda730..b411d5fafd141fccef40db9369af17c0e2279495 100644
--- a/chrome/browser/prefs/pref_registry_syncable.h
+++ b/chrome/browser/prefs/pref_registry_syncable.h
@@ -21,19 +21,24 @@ class Value;
 // preference is syncable or not.
 class PrefRegistrySyncable : public PrefRegistry {
  public:
-  typedef base::Callback<void(const char* path)> SyncableRegistrationCallback;
-
   // Enum used when registering preferences to determine if it should
   // be synced or not.
   enum PrefSyncStatus {
     UNSYNCABLE_PREF,
-    SYNCABLE_PREF
+    SYNCABLE_PREF,
+    SYNCABLE_PRIORITY_PREF,
   };
 
+  typedef
+      base::Callback<void(const char* path, const PrefSyncStatus sync_status)>
+          SyncableRegistrationCallback;
+
   PrefRegistrySyncable();
 
+  typedef std::map<std::string, PrefSyncStatus> PrefToStatus;
+
   // Retrieve the set of syncable preferences currently registered.
-  const std::set<std::string>& syncable_preferences() const;
+  const PrefToStatus& syncable_preferences() const;
 
   // Exactly one callback can be set for the event of a syncable
   // preference being registered. It will be fired after the
@@ -102,7 +107,7 @@ class PrefRegistrySyncable : public PrefRegistry {
   SyncableRegistrationCallback callback_;
 
   // Contains the names of all registered preferences that are syncable.
-  std::set<std::string> syncable_preferences_;
+  PrefToStatus syncable_preferences_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefRegistrySyncable);
 };