Register Physical Web preference in Chrome's local state

ios/chrome/browser/physical_web/physical_web_local_state.mm

Index: ios/chrome/browser/physical_web/physical_web_local_state.mm
diff --git a/ios/chrome/browser/physical_web/physical_web_local_state.mm b/ios/chrome/browser/physical_web/physical_web_local_state.mm
new file mode 100644
index 0000000000000000000000000000000000000000..ab0b1009de2d0d5d19dee1596e8f908aa69c92ee
--- /dev/null
+++ b/ios/chrome/browser/physical_web/physical_web_local_state.mm
@@ -0,0 +1,18 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/chrome/browser/physical_web/physical_web_local_state.h"
+
+#include "components/prefs/pref_registry_simple.h"
+#include "ios/chrome/browser/physical_web/physical_web_constants.h"
+#include "ios/chrome/browser/pref_names.h"
+
+@implementation PhysicalWebLocalState
+
++ (void)registerLocalState:(PrefRegistrySimple*)registry {
+  registry->RegisterIntegerPref(prefs::kIosPhysicalWebEnabled,
+                                physical_web::kPhysicalWebOnboarding);
+}
+
+@end