Support Sync following Gaia OAuth authentication

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index b93be55362b8ec64317fa7c5be3a481ad73478c5..fb54d09a6142058daec0caf4c5d046d4dcb8113f 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -4428,6 +4428,12 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_SYNC_SESSIONS_DESCRIPTION" desc="Description for the flag to enable syncing the Sessions datatype">
         Enable sessions in the sync options. This allows syncing your sessions to other clients.
       </message>
+      <message name="IDS_FLAGS_SYNC_OAUTH_NAME" desc="Title for the flag to enable authenticating with OAuth">
+        Use OAuth to authenticate Sync operations.
+      </message>
+      <message name="IDS_FLAGS_SYNC_OAUTH_DESCRIPTION" desc="Description for the flag to enable authenticating with OAuth">
+        Use OAuth, rather than ClientLogin, to authenticate Sync operations.  This decouples authentication-specific user interface elements from the browser and enables a rich set of second-factor mechanisms.
+      </message>
       <message name="IDS_FLAGS_SYNC_TYPED_URLS_NAME" desc="Title for the flag to enable syncing the TypedUrl datatype">
         Enable syncing Omnibox History
       </message>