WIP: Introduce per-TabContents PrefService.

chrome/browser/prefs/pref_notifier_impl.cc

Index: chrome/browser/prefs/pref_notifier_impl.cc
diff --git a/chrome/browser/prefs/pref_notifier_impl.cc b/chrome/browser/prefs/pref_notifier_impl.cc
index 2dd454f948092ed223eeaf2916302ae64ff8a561..d84d51e5cdb91dc2796480dc05fb1b9425afd8e5 100644
--- a/chrome/browser/prefs/pref_notifier_impl.cc
+++ b/chrome/browser/prefs/pref_notifier_impl.cc
@@ -5,13 +5,15 @@
 #include "chrome/browser/prefs/pref_notifier_impl.h"
 
 #include "base/stl_util.h"
+#include "chrome/browser/prefs/pref_model_associator.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/common/notification_observer.h"
 #include "content/common/notification_service.h"
 
-PrefNotifierImpl::PrefNotifierImpl(PrefService* service)
-    : pref_service_(service) {
+PrefNotifierImpl::PrefNotifierImpl()
+    : pref_service_(NULL),
+      pref_model_associator_(NULL) {
 }
 
 PrefNotifierImpl::~PrefNotifierImpl() {
@@ -71,6 +73,14 @@ void PrefNotifierImpl::RemovePrefObserver(const char* path,
   observer_list->RemoveObserver(obs);
 }
 
+void PrefNotifierImpl::SetSource(PrefService* pref_service) {
+  pref_service_ = pref_service;
+}
+
+void PrefNotifierImpl::SetPrefModelAssociator(PrefModelAssociator* associator) {
+  pref_model_associator_ = associator;
+}
+
 void PrefNotifierImpl::OnPreferenceChanged(const std::string& path) {
   FireObservers(path);
 }
@@ -88,9 +98,13 @@ void PrefNotifierImpl::FireObservers(const std::string& path) {
   DCHECK(CalledOnValidThread());
 
   // Only send notifications for registered preferences.
-  if (!pref_service_->FindPreference(path.c_str()))
+  if (!pref_service_ || !pref_service_->FindPreference(path.c_str()))
     return;
 
+  // Notify the associator.
+  if (pref_model_associator_)
+    pref_model_associator_->ProcessPrefChange(path);
+
   const PrefObserverMap::iterator observer_iterator =
       pref_observers_.find(path);
   if (observer_iterator == pref_observers_.end())