[sync] skeleton implementation of AutocompleteSyncBridge

chrome/browser/sync/chrome_sync_client.cc

Index: chrome/browser/sync/chrome_sync_client.cc
diff --git a/chrome/browser/sync/chrome_sync_client.cc b/chrome/browser/sync/chrome_sync_client.cc
index 00281a541b3d688ad2a5a879e0641c17d34efc8f..aa3929c89dd988b67fbc2dfc7ca67eb124f7dad3 100644
--- a/chrome/browser/sync/chrome_sync_client.cc
+++ b/chrome/browser/sync/chrome_sync_client.cc
@@ -38,6 +38,7 @@
 #include "chrome/common/features.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
+#include "components/autofill/core/browser/webdata/autocomplete_sync_bridge.h"
 #include "components/autofill/core/browser/webdata/autocomplete_syncable_service.h"
 #include "components/autofill/core/browser/webdata/autofill_profile_syncable_service.h"
 #include "components/autofill/core/browser/webdata/autofill_wallet_metadata_syncable_service.h"
@@ -440,6 +441,10 @@ ChromeSyncClient::GetSyncBridgeForModelType(syncer::ModelType type) {
       // Reading List is only supported on iOS at the moment.
       NOTREACHED();
       return base::WeakPtr<syncer::ModelTypeSyncBridge>();
+    case syncer::AUTOFILL:
+      return autofill::AutocompleteSyncBridge::FromWebDataService(
+                 web_data_service_.get())
+          ->AsWeakPtr();
     default:
       NOTREACHED();
       return base::WeakPtr<syncer::ModelTypeSyncBridge>();