Implement simple http server with set cookie functionality.

ios/web/public/test/response_providers/html_response_provider.mm

Index: ios/web/public/test/response_providers/html_response_provider.mm
diff --git a/ios/web/public/test/response_providers/html_response_provider.mm b/ios/web/public/test/response_providers/html_response_provider.mm
index c2e97450f360545fbb5303e1322fa38b204d7a5e..396f7a5b0d347f7cdaeeaf67b00d47db5b87bc2c 100644
--- a/ios/web/public/test/response_providers/html_response_provider.mm
+++ b/ios/web/public/test/response_providers/html_response_provider.mm
@@ -15,6 +15,12 @@
     : response_provider_impl_(new HtmlResponseProviderImpl(responses)) {}
 
 HtmlResponseProvider::HtmlResponseProvider(
+    const std::map<GURL, std::string>& responses,
+    const std::string& cookie)
+    : response_provider_impl_(new HtmlResponseProviderImpl(responses, cookie)) {
+}
+
+HtmlResponseProvider::HtmlResponseProvider(
     const std::map<GURL, HtmlResponseProviderImpl::Response>& responses)
     : response_provider_impl_(new HtmlResponseProviderImpl(responses)) {}