Add the client for accessing Subresource Filter only list.

components/subresource_filter/content/browser/subresource_filter_activation_navigation_throttle.h

Index: components/subresource_filter/content/browser/subresource_filter_activation_navigation_throttle.h
diff --git a/components/subresource_filter/content/browser/subresource_filter_activation_navigation_throttle.h b/components/subresource_filter/content/browser/subresource_filter_activation_navigation_throttle.h
new file mode 100644
index 0000000000000000000000000000000000000000..81770789b169c1b9a9f1a970858b18d0f021ccc7
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+++ b/components/subresource_filter/content/browser/subresource_filter_activation_navigation_throttle.h
@@ -0,0 +1,74 @@
+// 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_ACTIVATION_RESOURCE_THROTTLE_H_
+#define COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_SUBRESOURCE_FILTER_ACTIVATION_RESOURCE_THROTTLE_H_
+
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/time/time.h"
+#include "base/timer/timer.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.
+class SubresourceFilterActivationNavigationThrottle
+    : public content::NavigationThrottle,
+      public safe_browsing::SafeBrowsingDatabaseManager::Client,
+      public base::SupportsWeakPtr<
+          SubresourceFilterActivationNavigationThrottle> {
+ public:
+  SubresourceFilterActivationNavigationThrottle(
+      content::NavigationHandle* handle,
+      const scoped_refptr<safe_browsing::SafeBrowsingDatabaseManager>&
+          database_manager);
+
+  ~SubresourceFilterActivationNavigationThrottle() override;
+
+  content::NavigationThrottle::ThrottleCheckResult WillProcessResponse()
+      override;
+
+  // SafeBrowsingDabaseManager::Client implementation (called on IO thread):
+  void OnCheckBrowseUrlResult(
+      const GURL& url,
+      safe_browsing::SBThreatType result,
+      const safe_browsing::ThreatMetadata& metadata) override;
+
+ private:
+  // Starts running |url| through the safe browsing check. Returns true if the
+  // URL doesn't belong to the Subresource Filter only list. Otherwise returns
+  // false and will call OnCheckBrowseUrlResult() when the check
+  // has completed.
+  bool CheckUrl(const GURL& url);
+
+  // Callback for when the safe browsing check has taken longer than
+  // kCheckUrlTimeoutMs.
+  void OnCheckUrlTimeout();
+
+  void CheckUrlOnIO(const GURL& url);
+
+  void OnCheckUrlResultOnUI(const GURL& url,
+                            safe_browsing::SBThreatType threat_type,
+                            safe_browsing::ThreatPatternType pattern_type);
+
+  // The time when we started deferring the request.
+  base::TimeTicks defer_start_time_;
+
+  // Timer to abort the safe browsing check if it takes too long.
+  base::OneShotTimer timer_;
+
+  scoped_refptr<safe_browsing::SafeBrowsingDatabaseManager> database_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(SubresourceFilterActivationNavigationThrottle);
+};
+
+}  // namespace subresource_filter
+
+#endif  // COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_SUBRESOURCE_FILTER_ACTIVATION_RESOURCE_THROTTLE_H_