Add the client for accessing Subresource Filter only list.

components/subresource_filter/content/browser/subresource_filter_safe_browsing_activation_throttle.h

+// Copyright (c) 2017 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_SAFE_BROWSING_ACTIVATION_THROTTLE_H_
+#define COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_SUBRESOURCE_FILTER_SAFE_BROWSING_ACTIVATION_THROTTLE_H_
+
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "base/single_thread_task_runner.h"
+#include "components/safe_browsing_db/database_manager.h"

[engedy, 2017/03/10 14:39:33]

nit: This include could be avoided if we fwd-declared the DatabaseManager and
#include'd "base/memory/ref_counted.h" and "components/safe_browsing_db/util.h"
instead.

[melandory, 2017/03/15 13:41:36]

For some weird reason it doesn't work

+#include "content/public/browser/navigation_throttle.h"
+#include "url/gurl.h"
+
+namespace subresource_filter {
+
+// Client for accessing list with patterns to be used by the Subresource Filter.
+class SubresourceFilterSafeBrowsingActivationThrottle
+    : public content::NavigationThrottle,
+      public base::SupportsWeakPtr<
+          SubresourceFilterSafeBrowsingActivationThrottle> {
+ public:
+  SubresourceFilterSafeBrowsingActivationThrottle(
+      content::NavigationHandle* handle,
+      const scoped_refptr<safe_browsing::SafeBrowsingDatabaseManager>&

[engedy, 2017/03/10 14:39:33]

style nit: According to [1], the new preferred way is now to pass in a
scoped_refptr by value, and std::move it into the member variable on the
initializer list.

1: https://www.chromium.org/developers/smart-pointer-guidelines

+          database_manager);
+
+  ~SubresourceFilterSafeBrowsingActivationThrottle() override;
+
+  // content::NavigationThrottle:
+  content::NavigationThrottle::ThrottleCheckResult WillProcessResponse()
+      override;
+
+  void OnCheckUrlResultOnUI(const GURL& url,
+                            safe_browsing::SBThreatType threat_type,
+                            safe_browsing::ThreatPatternType pattern_type);
+
+ private:
+  class ActivationClient;
+
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  std::unique_ptr<ActivationClient, base::OnTaskRunnerDeleter>
+      activation_client_;
+
+  DISALLOW_COPY_AND_ASSIGN(SubresourceFilterSafeBrowsingActivationThrottle);
+};
+
+}  // namespace subresource_filter
+
+#endif  // COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_SUBRESOURCE_FILTER_SAFE_BROWSING_ACTIVATION_THROTTLE_H_