Use FrameIsAd to decide whether to isolate a frame in TopDocumentIsolation mode.

chrome/browser/page_load_metrics/ads_detection.h

+// Copyright 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 CHROME_BROWSER_PAGE_LOAD_METRICS_ADS_DETECTION_H_
+#define CHROME_BROWSER_PAGE_LOAD_METRICS_ADS_DETECTION_H_
+
+#include <bitset>
+
+namespace content {
+class NavigationHandle;
+}  // namespace content
+
+namespace page_load_metrics {
+
+// The types of ads that one can detect or filter on.
+enum AdType {
+  AD_TYPE_GOOGLE = 0,
+  AD_TYPE_SUBRESOURCE_FILTER = 1,
+  AD_TYPE_ALL = 2,
+  AD_TYPE_MAX = AD_TYPE_ALL
+};
+using AdTypes = std::bitset<AD_TYPE_MAX>;
+
+// Uses heuristics to determine if |navigation_handle| is a navigation for an
+// ad.  Must be called no earlier than
+// NavigationHandleImpl::ReadyToCommitNavigation.
+const AdTypes& GetDetectedAdTypes(content::NavigationHandle* navigation_handle);
+
+// Marks the |navigation_handle| as loading an advertisment of a given |type|.
+void SetDetectedAdType(content::NavigationHandle* navigation_handle,
+                       AdType type);
+
+}  // namespace page_load_metrics
+
+#endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_ADS_DETECTION_H_