WIP: Introduce per-TabContents PrefService.

chrome/browser/prefs/pref_notifier_impl.h

Index: chrome/browser/prefs/pref_notifier_impl.h
diff --git a/chrome/browser/prefs/pref_notifier_impl.h b/chrome/browser/prefs/pref_notifier_impl.h
index 8323fcbec5bc3804384df50c59f8d0eb81c34d54..e776ddb9ed1fffdf1418eeadc6cf786d739cf2e2 100644
--- a/chrome/browser/prefs/pref_notifier_impl.h
+++ b/chrome/browser/prefs/pref_notifier_impl.h
@@ -13,14 +13,15 @@
 #include "base/threading/non_thread_safe.h"
 #include "chrome/browser/prefs/pref_notifier.h"
 
-class PrefService;
 class NotificationObserver;
+class PrefModelAssociator;
+class PrefService;
 
 // The PrefNotifier implementation used by the PrefService.
 class PrefNotifierImpl : public PrefNotifier,
                          public base::NonThreadSafe {
  public:
-  explicit PrefNotifierImpl(PrefService* pref_service);
+  PrefNotifierImpl();
   virtual ~PrefNotifierImpl();
 
   // If the pref at the given path changes, we call the observer's Observe
@@ -32,6 +33,12 @@ class PrefNotifierImpl : public PrefNotifier,
   virtual void OnPreferenceChanged(const std::string& pref_name);
   virtual void OnInitializationCompleted(bool succeeded);
 
+  // Sets the source PrefService.
+  void SetSource(PrefService* pref_service);
+
+  // Sets the associator.
+  void SetPrefModelAssociator(PrefModelAssociator* associator);
+
  protected:
   // A map from pref names to a list of observers. Observers get fired in the
   // order they are added. These should only be accessed externally for unit
@@ -52,6 +59,9 @@ class PrefNotifierImpl : public PrefNotifier,
 
   PrefObserverMap pref_observers_;
 
+  // The sync associator that needs to be notified on every pref change.
+  PrefModelAssociator* pref_model_associator_;
+
   DISALLOW_COPY_AND_ASSIGN(PrefNotifierImpl);
 };