[ios Mojo] Supporting code for define WebUI function.

ios/web/public/test/test_web_client.mm

Index: ios/web/public/test/test_web_client.mm
diff --git a/ios/web/public/test/test_web_client.mm b/ios/web/public/test/test_web_client.mm
index d3d4f3ba07afcd3562089756c8468eec89618e84..a5c6bad972500aec0a8b481746b70bd28abb7eba 100644
--- a/ios/web/public/test/test_web_client.mm
+++ b/ios/web/public/test/test_web_client.mm
@@ -5,6 +5,8 @@
 #import "ios/web/public/test/test_web_client.h"
 
 #include "base/logging.h"
+#include "ios/web/test/test_url_constants.h"
+#include "url/gurl.h"
 
 namespace web {
 
@@ -13,6 +15,16 @@ TestWebClient::TestWebClient()
 
 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);
+}
+
+bool TestWebClient::IsAppSpecificURL(const GURL& url) const {
+  return url.SchemeIs(kTestWebUIScheme);
+}
+
 NSString* TestWebClient::GetEarlyPageScript() const {
   return early_page_script_ ? early_page_script_.get() : @"";
 }