mandoline: Add back/forward support and UI.

components/web_view/url_request_cloneable.h

Index: components/web_view/url_request_cloneable.h
diff --git a/components/web_view/url_request_cloneable.h b/components/web_view/url_request_cloneable.h
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+// Copyright 2015 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 COMPONENTS_WEB_VIEW_URL_REQUEST_CLONEABLE_H_
+#define COMPONENTS_WEB_VIEW_URL_REQUEST_CLONEABLE_H_
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "mojo/services/network/public/interfaces/url_loader.mojom.h"
+
+namespace web_view {
+
+// This class caches data associated with a mojo::URLRequest and vends copies
+// of the request for the WebView system. Copies are used for repeated
+// navigations, but URLRequest structs are not copyable, as they contain
+// handles to transfer large amounts of data between processes, so we
+// immediately read the data from pipes and keep a copy here.
+class URLRequestCloneable {
+ public:
+  explicit URLRequestCloneable(mojo::URLRequestPtr original_request);
+  ~URLRequestCloneable();
+
+  // Creates a new URLRequest.
+  mojo::URLRequestPtr Clone() const;
+
+ private:
+  // All of these are straight from mojo::URLRequest.
+  mojo::String url_;
+  mojo::String method_;
+  mojo::Array<mojo::HttpHeaderPtr> headers_;
+  uint32_t response_body_buffer_size_;
+  bool auto_follow_redirects_;
+  bool bypass_cache_;
+
+  // Whether the body mojo array in the |original_request| was null. We keep
+  // track of this so we can differentiate between null arrays and empty
+  // arrays.
+  bool original_body_null_;
+
+  // This is a serialized version of the data from mojo::URLRequest. We copy
+  // this data straight out of the data pipes, and then serve it any time that
+  // AsURLRequest() is called.
+  std::vector<std::string> body_;
+
+  DISALLOW_COPY_AND_ASSIGN(URLRequestCloneable);
+};
+
+}  // namespace web_view
+
+#endif  // COMPONENTS_WEB_VIEW_URL_REQUEST_CLONEABLE_H_