Add a Physical Web data source

ios/chrome/browser/physical_web/create_physical_web_data_source.mm

Index: ios/chrome/browser/physical_web/create_physical_web_data_source.mm
diff --git a/ios/chrome/browser/physical_web/create_physical_web_data_source.mm b/ios/chrome/browser/physical_web/create_physical_web_data_source.mm
new file mode 100644
index 0000000000000000000000000000000000000000..055952ad3d807f9dae6fa0d1a4c488eda6455ce9
--- /dev/null
+++ b/ios/chrome/browser/physical_web/create_physical_web_data_source.mm
@@ -0,0 +1,12 @@
+// 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.
+
+#include "ios/chrome/browser/physical_web/create_physical_web_data_source.h"
+
+#include "base/memory/ptr_util.h"
+#import "ios/chrome/common/physical_web/ios_chrome_physical_web_data_source.h"
+
+std::unique_ptr<PhysicalWebDataSource> CreateIOSChromePhysicalWebDataSource() {
+  return base::MakeUnique<IOSChromePhysicalWebDataSource>();
+}