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
index 130e0470e0f0eab79638ca20c9a2a92ec293faf1..42a109215ef0fd7bf205a81614e4b2375e0a7ca1 100644
--- a/ios/public/provider/chrome/browser/native_app_launcher/BUILD.gn
+++ b/ios/public/provider/chrome/browser/native_app_launcher/BUILD.gn
@@ -8,4 +8,21 @@ source_set("native_app_launcher") {
     "native_app_types.h",
     "native_app_whitelist_manager.h",
   ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}
+
+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" ]
 }