Add AttachmentMetadata to Sync's EntryKernel.

sync/syncable/entry_kernel.cc

Index: sync/syncable/entry_kernel.cc
diff --git a/sync/syncable/entry_kernel.cc b/sync/syncable/entry_kernel.cc
index 97344838fbd60fd2620596967c758ec82db34f01..0821999b8cdffa25a32576b99ec2175cdacd755a 100644
--- a/sync/syncable/entry_kernel.cc
+++ b/sync/syncable/entry_kernel.cc
@@ -129,6 +129,11 @@ base::StringValue* UniquePositionToValue(const UniquePosition& pos) {
   return new base::StringValue(pos.ToDebugString());
 }
 
+base::StringValue* AttachmentMetadataToValue(
+    const sync_pb::AttachmentMetadata& a) {
+  return new base::StringValue(a.SerializeAsString());
+}
+
 }  // namespace
 
 base::DictionaryValue* EntryKernel::ToValue(
@@ -186,6 +191,14 @@ base::DictionaryValue* EntryKernel::ToValue(
                  &GetUniquePositionFieldString, &UniquePositionToValue,
                  UNIQUE_POSITION_FIELDS_BEGIN, UNIQUE_POSITION_FIELDS_END - 1);
 
+  // AttachmentMetadata fields
+  SetFieldValues(*this,
+                 kernel_info,
+                 &GetAttachmentMetadataFieldString,
+                 &AttachmentMetadataToValue,
+                 ATTACHMENT_METADATA_FIELDS_BEGIN,
+                 ATTACHMENT_METADATA_FIELDS_END - 1);
+
   // Bit temps.
   SetFieldValues(*this, kernel_info,
                  &GetBitTempString, &BooleanToValue,