Navigation throttle for the Safe Browsing Subresource Filter.

components/subresource_filter/content/browser/subresource_filter_navigation_throttle.h

Index: components/subresource_filter/content/browser/subresource_filter_navigation_throttle.h
diff --git a/components/subresource_filter/content/browser/subresource_filter_navigation_throttle.h b/components/subresource_filter/content/browser/subresource_filter_navigation_throttle.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 COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_SUBRESOURCE_FILTER_NAVIGATION_THROTTLE_
+#define COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_SUBRESOURCE_FILTER_NAVIGATION_THROTTLE_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "content/public/browser/navigation_throttle.h"
+#include "url/gurl.h"
+
+namespace content {
+class NavigationHandle;
+}  // content
+
+namespace subresource_filter {
+
+// This class has two resposibilities:
+// * it tracks the redirects that happen after Safe Browsing detects that the
+//   page being loaded contains deceptive embedded content. If such a redirect
+//   happens and leads to new domains, these are also put on the activation list
+//   of the tab.
+// * it creates a ContentSubresourceFilterDriver for the tab when the final site
+//   of a (potentially empty) redirect chain is reached and any URL of the
+//   redirect chain was on the activation list.
+// This throttle is active only for main frame http or https navigations and
+// doesn't act on subframe navigations or subresource loads.
+class SubresourceFilterNavigationThrottle : public content::NavigationThrottle {
+ public:
+  static std::unique_ptr<content::NavigationThrottle> Create(
+      content::NavigationHandle* handle);
+  ~SubresourceFilterNavigationThrottle() override;
+
+  // content::NavigationThrottle implementation:
+  ThrottleCheckResult WillRedirectRequest() override;
+  ThrottleCheckResult WillProcessResponse() override;
+
+ private:
+  explicit SubresourceFilterNavigationThrottle(
+      content::NavigationHandle* navigation_handle);
+
+  GURL initial_url_;
+
+  DISALLOW_COPY_AND_ASSIGN(SubresourceFilterNavigationThrottle);
+};
+
+}  // namespace subresource_filter
+
+#endif  // COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_SUBRESOURCE_FILTER_NAVIGATION_THROTTLE_