Web shell test to go back and forward.

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

Index: ios/web/public/test/response_providers/html_response_provider.h
diff --git a/ios/web/public/test/response_providers/html_response_provider.h b/ios/web/public/test/response_providers/html_response_provider.h
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+++ b/ios/web/public/test/response_providers/html_response_provider.h
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+// 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.
+
+#ifndef IOS_WEB_PUBLIC_TEST_RESPONSE_PROVIDERS_HTML_RESPONSE_PROVIDER_H_
+#define IOS_WEB_PUBLIC_TEST_RESPONSE_PROVIDERS_HTML_RESPONSE_PROVIDER_H_
+
+#include <map>
+#include <string>
+
+#include "base/memory/ref_counted.h"
+#include "ios/web/public/test/response_providers/data_response_provider.h"
+#include "ios/web/public/test/response_providers/html_response_provider_impl.h"
+#include "ios/web/public/test/response_providers/response_provider.h"
+#include "url/gurl.h"
+
+namespace net {
+class HttpResponseHeaders;
+}
+
+// A web::DataResponseProvider that maps URLs to requests.
+// Note: This works with the web::test::HttpServer and hence works on UIWebView

[Eugene But (OOO till 7-30), 2016/04/21 17:07:51]

Please drop this comment. We don't support UIWebView anymore.

[baxley, 2016/04/21 21:52:50]

Done.

+// and WKWebView.
+class HtmlResponseProvider : public web::DataResponseProvider {
+ public:
+  // Constructs an HtmlResponseProvider that does not respond to any request.
+  HtmlResponseProvider();
+  // Constructs an HtmlResponseProvider that generates a simple string response
+  // to a URL based on the mapping present in |responses|.
+  explicit HtmlResponseProvider(const std::map<GURL, std::string>& responses);
+  // Constructs an HtmlResponseProvider that generates a response to a URL based
+  // on the mapping present in |responses|.
+  explicit HtmlResponseProvider(
+      const std::map<GURL, HtmlResponseProviderImpl::Response>& responses);
+
+  ~HtmlResponseProvider() override;
+
+  // web::ResponseProvider implementation.
+  bool CanHandleRequest(const Request& request) override;
+  // web::DataResponseProvider implementation.
+  void GetResponseHeadersAndBody(
+      const Request& request,
+      scoped_refptr<net::HttpResponseHeaders>* headers,
+      std::string* response_body) override;
+
+ private:
+  std::unique_ptr<HtmlResponseProviderImpl> response_provider_impl_;
+};
+
+#endif  // IOS_WEB_PUBLIC_TEST_RESPONSE_PROVIDERS_HTML_RESPONSE_PROVIDER_H_