EnumTraits for base::i18n::TextDirection.

mojo/common/test_common_custom_types.mojom

Index: mojo/common/test_common_custom_types.mojom
diff --git a/mojo/common/test_common_custom_types.mojom b/mojo/common/test_common_custom_types.mojom
index c618032a20c4f9714bbd3f5cbaed148ca06f124b..0f13680f6827c771b65a15129d944132d7166856 100644
--- a/mojo/common/test_common_custom_types.mojom
+++ b/mojo/common/test_common_custom_types.mojom
@@ -7,6 +7,7 @@ module mojo.common.test;
 import "mojo/common/file.mojom";
 import "mojo/common/file_path.mojom";
 import "mojo/common/string16.mojom";
+import "mojo/common/text_direction.mojom";
 import "mojo/common/time.mojom";
 import "mojo/common/unguessable_token.mojom";
 import "mojo/common/values.mojom";
@@ -52,3 +53,9 @@ interface TestFile {
   BounceFile(mojo.common.mojom.File? in)
       => (mojo.common.mojom.File? out);
 };
+
+interface TestTextDirection {
+  [Sync]
+  BounceTextDirection(mojo.common.mojom.TextDirection in)
+      => (mojo.common.mojom.TextDirection out);
+};