Thread-safe version of PassphraseType.

components/sync/syncable/nigori_handler.h

Index: components/sync/syncable/nigori_handler.h
diff --git a/components/sync/syncable/nigori_handler.h b/components/sync/syncable/nigori_handler.h
index 2f9682cb06f9ab92b6f8d442ebc6b3af302eaf12..6baa0cca058c596fc9fd8056019ef0917ea4a1b5 100644
--- a/components/sync/syncable/nigori_handler.h
+++ b/components/sync/syncable/nigori_handler.h
@@ -21,6 +21,9 @@ class NigoriSpecifics;
 }
 
 namespace syncer {
+
+enum class PassphraseType;
+
 namespace syncable {
 
 class BaseTransaction;
@@ -56,6 +59,10 @@ class NigoriHandler {
   // Returns the set of currently encrypted types.
   virtual ModelTypeSet GetEncryptedTypes(
       syncable::BaseTransaction* const trans) const = 0;
+
+  // Returns current value for the passphrase type.
+  virtual PassphraseType GetPassphraseType(
+      syncable::BaseTransaction* const trans) const = 0;
 };
 
 }  // namespace syncable