Add sync experiment flag for wallet datatype.

sync/internal_api/public/util/experiments.h

Index: sync/internal_api/public/util/experiments.h
diff --git a/sync/internal_api/public/util/experiments.h b/sync/internal_api/public/util/experiments.h
index b61742d1a9c762f51cd49c93663cd2327773a802..d2b82c62363dadea5267785990b38c0991b6653b 100644
--- a/sync/internal_api/public/util/experiments.h
+++ b/sync/internal_api/public/util/experiments.h
@@ -16,6 +16,7 @@ const char kPreCommitUpdateAvoidanceTag[] = "pre_commit_update_avoidance";
 const char kGCMChannelTag[] = "gcm_channel";
 const char kEnhancedBookmarksTag[] = "enhanced_bookmarks";
 const char kGCMInvalidationsTag[] = "gcm_invalidations";
+const char kWalletSyncTag[] = "wallet_sync";
 
 // A structure to hold the enable status of experimental sync features.
 struct Experiments {
@@ -29,15 +30,16 @@ struct Experiments {
       : favicon_sync_limit(200),
         gcm_channel_state(UNSET),
         enhanced_bookmarks_enabled(false),
-        gcm_invalidations_enabled(true)  // By default GCM channel is enabled.
-  {}
+        gcm_invalidations_enabled(true),  // By default GCM channel is enabled.
+        wallet_sync_enabled(false) {}
 
   bool Matches(const Experiments& rhs) {
     return (favicon_sync_limit == rhs.favicon_sync_limit &&
             gcm_channel_state == rhs.gcm_channel_state &&
             enhanced_bookmarks_enabled == rhs.enhanced_bookmarks_enabled &&
             enhanced_bookmarks_ext_id == rhs.enhanced_bookmarks_ext_id &&
-            gcm_invalidations_enabled == rhs.gcm_invalidations_enabled);
+            gcm_invalidations_enabled == rhs.gcm_invalidations_enabled &&
+            wallet_sync_enabled == rhs.wallet_sync_enabled);
   }
 
   // The number of favicons that a client is permitted to sync.
@@ -54,6 +56,9 @@ struct Experiments {
 
   // Enhanced bookmarks extension id.
   std::string enhanced_bookmarks_ext_id;
+
+  // Enable the Wallet Autofill sync datatype.
+  bool wallet_sync_enabled;
 };
 
 }  // namespace syncer