Add the client for accessing Subresource Filter only list.

chrome/browser/subresource_filter/navigation_throttle_util.cc

Index: chrome/browser/subresource_filter/navigation_throttle_util.cc
diff --git a/chrome/browser/subresource_filter/navigation_throttle_util.cc b/chrome/browser/subresource_filter/navigation_throttle_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..96f6eb76033b8c498208afaba8fc00f8ec6ce23e
--- /dev/null
+++ b/chrome/browser/subresource_filter/navigation_throttle_util.cc
@@ -0,0 +1,26 @@
+// 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.
+
+#include "chrome/browser/subresource_filter/navigation_throttle_util.h"
+
+#include "base/memory/ptr_util.h"
+#include "chrome/browser/safe_browsing/safe_browsing_service.h"
+#include "components/safe_browsing_db/v4_feature_list.h"
+#include "components/subresource_filter/content/browser/subresource_filter_activation_navigation_throttle.h"
+#include "content/public/browser/navigation_handle.h"
+
+std::unique_ptr<content::NavigationThrottle>
+MaybeCreateSubresourceFilterNavigationThrottle(
+    content::NavigationHandle* handle,
+    safe_browsing::SafeBrowsingService* sb_service) {
+  if (handle->IsInMainFrame() &&
+      sb_service->database_manager()->IsSupported() &&
+      safe_browsing::V4FeatureList::GetV4UsageStatus() ==
+          safe_browsing::V4FeatureList::V4UsageStatus::V4_ONLY) {
+    return base::WrapUnique(
+        new subresource_filter::SubresourceFilterActivationNavigationThrottle(
+            handle, sb_service->database_manager()));
+  }
+  return nullptr;
+}