Add PrefStore::GetValues

components/prefs/pref_value_map.h

Index: components/prefs/pref_value_map.h
diff --git a/components/prefs/pref_value_map.h b/components/prefs/pref_value_map.h
index b0ffbd15fdda3ef1900cf507aec5bd4768d10a24..bad10cf978487bcab777ec445066d9ad20049052 100644
--- a/components/prefs/pref_value_map.h
+++ b/components/prefs/pref_value_map.h
@@ -14,6 +14,7 @@
 #include "components/prefs/base_prefs_export.h"
 
 namespace base {
+class DictionaryValue;
 class Value;
 }
 
@@ -83,6 +84,9 @@ class COMPONENTS_PREFS_EXPORT PrefValueMap {
   void GetDifferingKeys(const PrefValueMap* other,
                         std::vector<std::string>* differing_keys) const;
 
+  // Copies the map into a dictionary value.
+  std::unique_ptr<base::DictionaryValue> AsDictionaryValue() const;
+
  private:
   Map prefs_;