Web shell test to go back and forward.

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

+// 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.
+
+#include "ios/web/public/test/response_providers/html_response_provider.h"
+
+#include "ios/web/public/test/response_providers/response_provider.h"
+#include "url/gurl.h"
+
+HtmlResponseProvider::HtmlResponseProvider()
+    : response_provider_impl_(new HtmlResponseProviderImpl()) {}
+
+HtmlResponseProvider::HtmlResponseProvider(
+    const std::map<GURL, std::string>& responses)
+    : response_provider_impl_(new HtmlResponseProviderImpl(responses)) {}
+
+HtmlResponseProvider::HtmlResponseProvider(
+    const std::map<GURL, HtmlResponseProviderImpl::Response>& responses)
+    : response_provider_impl_(new HtmlResponseProviderImpl(responses)) {}
+
+HtmlResponseProvider::~HtmlResponseProvider() {}
+
+bool HtmlResponseProvider::CanHandleRequest(
+    const web::ResponseProvider::Request& request) {
+  return response_provider_impl_->CanHandleRequest(request);
+}
+
+void HtmlResponseProvider::GetResponseHeadersAndBody(
+    const Request& request,
+    scoped_refptr<net::HttpResponseHeaders>* headers,
+    std::string* response_body) {
+  response_provider_impl_->GetResponseHeadersAndBody(request, headers,
+                                                     response_body);
+}