cryptohome: Add dbus method and signal name for encryption migration.

chromeos/cryptohome/homedir_methods.cc

Index: chromeos/cryptohome/homedir_methods.cc
diff --git a/chromeos/cryptohome/homedir_methods.cc b/chromeos/cryptohome/homedir_methods.cc
index 617c17afd9cf2c864daa36fe585939009aa64e42..727a8711798753c4fe4c496c2d8da1b061e0ebc0 100644
--- a/chromeos/cryptohome/homedir_methods.cc
+++ b/chromeos/cryptohome/homedir_methods.cc
@@ -298,6 +298,18 @@ class HomedirMethodsImpl : public HomedirMethods {
                        weak_ptr_factory_.GetWeakPtr(), callback));
   }
 
+  void MigrateToDircrypto(const Identification& id,
+                          const Authorization& auth,
+                          const Callback& callback) override {
+    cryptohome::AuthorizationRequest auth_proto;
+    FillAuthorizationProtobuf(auth, &auth_proto);
+
+    DBusThreadManager::Get()->GetCryptohomeClient()->MigrateToDircrypto(
+        id, auth_proto,
+        base::Bind(&HomedirMethodsImpl::OnBaseReplyCallback,
+                   weak_ptr_factory_.GetWeakPtr(), callback));
+  }
+
  private:
   void OnGetKeyDataExCallback(const GetKeyDataCallback& callback,
                               chromeos::DBusMethodCallStatus call_status,