Add AttachmentMetadata to Sync's EntryKernel.

sync/syncable/syncable_enum_conversions_unittest.cc

Index: sync/syncable/syncable_enum_conversions_unittest.cc
diff --git a/sync/syncable/syncable_enum_conversions_unittest.cc b/sync/syncable/syncable_enum_conversions_unittest.cc
index f74d1301ae46644863506cf25e6eea8751fa5120..d11d01747e60d9ec316705ddb0d3119ebe7606db 100644
--- a/sync/syncable/syncable_enum_conversions_unittest.cc
+++ b/sync/syncable/syncable_enum_conversions_unittest.cc
@@ -83,6 +83,12 @@ TEST_F(SyncableEnumConversionsTest, GetUniquePositionFieldString) {
       UNIQUE_POSITION_FIELDS_BEGIN, UNIQUE_POSITION_FIELDS_END - 1);
 }
 
+TEST_F(SyncableEnumConversionsTest, GetAttachmentMetadataFieldString) {
+  TestEnumStringFunction(
+      GetAttachmentMetadataFieldString,
+      ATTACHMENT_METADATA_FIELDS_BEGIN, ATTACHMENT_METADATA_FIELDS_END - 1);
+}
+
 TEST_F(SyncableEnumConversionsTest, GetBitTempString) {
   TestEnumStringFunction(
       GetBitTempString, BIT_TEMPS_BEGIN, BIT_TEMPS_END - 1);