Create FakeProviders for NativeAppMetadata and NativeAppManager

ios/public/provider/chrome/browser/native_app_launcher/BUILD.gn

Index: ios/public/provider/chrome/browser/native_app_launcher/BUILD.gn
diff --git a/ios/public/provider/chrome/browser/native_app_launcher/BUILD.gn b/ios/public/provider/chrome/browser/native_app_launcher/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..1673276a6edfc45a7600fc2d8b96a31819b39e64
--- /dev/null
+++ b/ios/public/provider/chrome/browser/native_app_launcher/BUILD.gn
@@ -0,0 +1,19 @@
+# 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.
+
+source_set("test_support") {
+  testonly = true
+  sources = [
+    "fake_native_app_metadata.h",
+    "fake_native_app_metadata.mm",
+    "fake_native_app_whitelist_manager.h",
+    "fake_native_app_whitelist_manager.mm",
+  ]
+  deps = [
+    "//base",
+    "//ios/public/provider/chrome/browser",
+    "//url",
+  ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}