Aggregate DocumentSubresourceFilter counters on page level.

components/subresource_filter/content/common/document_load_statistics.h

Index: components/subresource_filter/content/common/document_load_statistics.h
diff --git a/components/subresource_filter/content/common/document_load_statistics.h b/components/subresource_filter/content/common/document_load_statistics.h
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+// Copyright 2016 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_COMMON_DOCUMENT_LOAD_STATISTICS_H_
+#define COMPONENTS_SUBRESOURCE_FILTER_CONTENT_COMMON_DOCUMENT_LOAD_STATISTICS_H_
+
+#include <stdint.h>
+
+#include "base/time/time.h"
+
+namespace subresource_filter {
+
+// Contains statistics and performance metrics collected by the
+// DocumentSubresourceFilter.
+struct DocumentLoadStatistics {
+  // The number of subresource loads that went through the
+  // DocumentSubresouceFilter::allowLoad method.
+  int32_t num_loads_total = 0;
+
+  // Statistics on the number of subresource loads that were evaluated, were
+  // matched by filtering rules, and were disallowed, respectively, during the
+  // lifetime of a DocumentSubresourceFilter.
+  int32_t num_loads_evaluated = 0;
+  int32_t num_loads_matching_rules = 0;
+  int32_t num_loads_disallowed = 0;
+
+  // Total time spent in allowLoad() calls while evaluating subresource loads.
+  base::TimeDelta evaluation_total_wall_duration;
+  base::TimeDelta evaluation_total_cpu_duration;
+};
+
+}  // namespace subresource_filter
+
+#endif  // COMPONENTS_SUBRESOURCE_FILTER_CONTENT_COMMON_DOCUMENT_LOAD_STATISTICS_H_