First experimental implementation of the Clear-Site-Data header

chrome/browser/browsing_data/clear_site_data_throttle.h

+// 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 CHROME_BROWSER_BROWSING_DATA_CLEAR_SITE_DATA_THROTTLE_H_
+#define CHROME_BROWSER_BROWSING_DATA_CLEAR_SITE_DATA_THROTTLE_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "base/values.h"
+#include "content/public/browser/resource_request_info.h"
+#include "content/public/browser/resource_throttle.h"
+
+class Profile;
+
+namespace content {
+class ResourceHandle;
+class ResourceRequestInfo;
+}
+
+namespace net {
+class URLRequest;
+}
+
+// This throttle asynchronously executes the clearing of browsing data.
+// It does not block navigation.
+class ClearSiteDataThrottle : public content::ResourceThrottle {
+ public:
+  explicit ClearSiteDataThrottle(const net::URLRequest* request);
+  ~ClearSiteDataThrottle() override;
+
+ public:
+  // ResourceThrottle implementation:
+  void WillProcessResponse(bool* defer) override;
+  const char* GetNameForLogging() const override;
+
+ private:
+  // Process the response. This must be done on UI thread, since both
+  // WebContentsGetter and BrowsingDataRemover require to be called from there.
+  // The |getter|, |domain| and |header| from the request are passed to this
+  // static method so that further processing can be independent from
+  // the lifetime of the throttle.
+  static void ProcessResponseOnUIThread(
+      const content::ResourceRequestInfo::WebContentsGetter& getter,
+      std::string domain,
+      std::string header);
+
+  // Called by ProcessResponseOnUIThread() after successful parsing of |header|.
+  // Clears data for the |profile| and |domain|. The datatypes are determined
+  // by the parsed |header|.
+  static void ClearData(
+      Profile* profile,
+      std::string domain,
+      std::unique_ptr<base::Value> header);
+
+  // Called by ProcessResponseOnUIThread() if header could not be parsed
+  // and reports the |error|.
+  static void OnParseError(const std::string& error);
+
+  const net::URLRequest* request_;
+
+  DISALLOW_COPY_AND_ASSIGN(ClearSiteDataThrottle);
+};
+
+#endif  // CHROME_BROWSER_BROWSING_DATA_CLEAR_SITE_DATA_THROTTLE_H_