Add the client for accessing Subresource Filter only list.

components/subresource_filter/content/browser/subresource_filter_safe_browsing_activation_throttle.h

Index: components/subresource_filter/content/browser/subresource_filter_safe_browsing_activation_throttle.h
diff --git a/components/subresource_filter/content/browser/subresource_filter_safe_browsing_activation_throttle.h b/components/subresource_filter/content/browser/subresource_filter_safe_browsing_activation_throttle.h
new file mode 100644
index 0000000000000000000000000000000000000000..a2e43b2d8ed0985210bd16c6b848a4ec6ea270e1
--- /dev/null
+++ b/components/subresource_filter/content/browser/subresource_filter_safe_browsing_activation_throttle.h
@@ -0,0 +1,52 @@
+// 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>

[engedy, 2017/03/21 13:44:16]

nit: Unused.
nit: #include <memory>

[melandory, 2017/03/24 15:49:28]

Done.

+#include <vector>

[engedy, 2017/03/21 13:44:16]

nit: Only used in .cc file.

[melandory, 2017/03/24 15:49:28]

Done.

+
+#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"
+#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.

[engedy, 2017/03/21 13:44:16]

Phrasing suggestion:

// Navigation throttle responsible for activating subresource filtering on page
loads that match the SUBRESOURCE_FILTER Safe Browsing list.

+class SubresourceFilterSafeBrowsingActivationThrottle
+    : public content::NavigationThrottle,
+      public base::SupportsWeakPtr<
+          SubresourceFilterSafeBrowsingActivationThrottle> {
+ public:
+  SubresourceFilterSafeBrowsingActivationThrottle(
+      content::NavigationHandle* handle,
+      scoped_refptr<safe_browsing::SafeBrowsingDatabaseManager>

[engedy, 2017/03/21 13:44:16]

#include "base/memory/ref_counted.h"

[melandory, 2017/03/24 15:49:28]

Done.

+          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 SBDatabaseClient;
+
+  scoped_refptr<base::SingleThreadTaskRunner> callback_task_runner_;
+  std::unique_ptr<SBDatabaseClient, base::OnTaskRunnerDeleter> database_client_;
+
+  DISALLOW_COPY_AND_ASSIGN(SubresourceFilterSafeBrowsingActivationThrottle);
+};
+
+}  // namespace subresource_filter
+
+#endif  // COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_SUBRESOURCE_FILTER_SAFE_BROWSING_ACTIVATION_THROTTLE_H_