Add PrefStore::GetValues

components/prefs/in_memory_pref_store.cc

Index: components/prefs/in_memory_pref_store.cc
diff --git a/components/prefs/in_memory_pref_store.cc b/components/prefs/in_memory_pref_store.cc
index d0d35582523908a612263c1bba93cd29b762c422..a0a9c35d47b5ee0e5312aaaee28bf6efa88a9c13 100644
--- a/components/prefs/in_memory_pref_store.cc
+++ b/components/prefs/in_memory_pref_store.cc
@@ -18,6 +18,10 @@ bool InMemoryPrefStore::GetValue(const std::string& key,
   return prefs_.GetValue(key, value);
 }
 
+std::unique_ptr<base::DictionaryValue> InMemoryPrefStore::GetValues() const {
+  return prefs_.AsDictionaryValue();
+}
+
 bool InMemoryPrefStore::GetMutableValue(const std::string& key,
                                         base::Value** value) {
   return prefs_.GetValue(key, value);