Add a NavigationThrottle to the public content/ interface

components/navigation_interception/intercept_navigation_resource_throttle.h

-// Copyright (c) 2012 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_NAVIGATION_INTERCEPTION_INTERCEPT_NAVIGATION_RESOURCE_THROTTLE_H_
-#define COMPONENTS_NAVIGATION_INTERCEPTION_INTERCEPT_NAVIGATION_RESOURCE_THROTTLE_H_
-
-#include <string>
-
-#include "base/callback.h"
-#include "base/memory/weak_ptr.h"
-#include "content/public/browser/resource_throttle.h"
-
-class GURL;
-
-namespace content {
-class WebContents;
-}
-
-namespace net {
-class URLRequest;
-}
-
-namespace navigation_interception {
-
-class NavigationParams;
-
-// This class allows the provider of the Callback to selectively ignore top
-// level navigations.
-class InterceptNavigationResourceThrottle : public content::ResourceThrottle {
- public:
-  typedef base::Callback<bool(
-          content::WebContents* /* source */,
-          const NavigationParams& /* navigation_params */)>
-      CheckOnUIThreadCallback;
-
-  InterceptNavigationResourceThrottle(
-      net::URLRequest* request,
-      CheckOnUIThreadCallback should_ignore_callback);
-  ~InterceptNavigationResourceThrottle() override;
-
-  // content::ResourceThrottle implementation:
-  void WillStartRequest(bool* defer) override;
-  void WillRedirectRequest(const net::RedirectInfo& redirect_info,
-                           bool* defer) override;
-  const char* GetNameForLogging() const override;
-
- private:
-  bool CheckIfShouldIgnoreNavigation(const GURL& url,
-                                     const std::string& method,
-                                     bool is_redirect);
-  void OnResultObtained(bool should_ignore_navigation);
-
-  net::URLRequest* request_;
-  CheckOnUIThreadCallback should_ignore_callback_;
-  base::WeakPtrFactory<InterceptNavigationResourceThrottle> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(InterceptNavigationResourceThrottle);
-};
-
-}  // namespace navigation_interception
-
-#endif  // COMPONENTS_NAVIGATION_INTERCEPTION_INTERCEPT_NAVIGATION_RESOURCE_THROTTLE_H_