Implemented WebStateObserver::DidFinishNavigation(NavigationHandle*).

ios/web/public/test/fakes/test_web_client.mm

Index: ios/web/public/test/fakes/test_web_client.mm
diff --git a/ios/web/public/test/fakes/test_web_client.mm b/ios/web/public/test/fakes/test_web_client.mm
index 8a62706ac5e6b4041bcdaa51f47268fbc93296f3..9baf4523db6db21e8ef65dbca3e4c46c7340ac00 100644
--- a/ios/web/public/test/fakes/test_web_client.mm
+++ b/ios/web/public/test/fakes/test_web_client.mm
@@ -18,12 +18,18 @@ TestWebClient::~TestWebClient() {}
 
 void TestWebClient::AddAdditionalSchemes(
     std::vector<url::SchemeWithType>* additional_standard_schemes) const {
-  url::SchemeWithType scheme = {kTestWebUIScheme, url::SCHEME_WITHOUT_PORT};
-  additional_standard_schemes->push_back(scheme);
+  url::SchemeWithType web_ui_scheme = {kTestWebUIScheme,
+                                       url::SCHEME_WITHOUT_PORT};
+  additional_standard_schemes->push_back(web_ui_scheme);
+
+  url::SchemeWithType native_scheme = {kTestNativeContentScheme,
+                                       url::SCHEME_WITHOUT_PORT};
+  additional_standard_schemes->push_back(native_scheme);
 }
 
 bool TestWebClient::IsAppSpecificURL(const GURL& url) const {
-  return url.SchemeIs(kTestWebUIScheme);
+  return url.SchemeIs(kTestWebUIScheme) ||
+         url.SchemeIs(kTestNativeContentScheme);
 }
 
 base::RefCountedMemory* TestWebClient::GetDataResourceBytes(