Add PrefStore::GetValues

components/prefs/default_pref_store.cc

Index: components/prefs/default_pref_store.cc
diff --git a/components/prefs/default_pref_store.cc b/components/prefs/default_pref_store.cc
index 468c11c74835a56871d48f40167c486ad4a5cd5b..0e9c87c08385c83473694ebecb60c56c17ee89d4 100644
--- a/components/prefs/default_pref_store.cc
+++ b/components/prefs/default_pref_store.cc
@@ -17,6 +17,10 @@ bool DefaultPrefStore::GetValue(const std::string& key,
   return prefs_.GetValue(key, result);
 }
 
+std::unique_ptr<base::DictionaryValue> DefaultPrefStore::GetValues() const {
+  return prefs_.AsDictionaryValue();
+}
+
 void DefaultPrefStore::AddObserver(PrefStore::Observer* observer) {
   observers_.AddObserver(observer);
 }