[subresource_filter] Add TRACE_EVENT probes for frame activation

components/subresource_filter/core/common/activation_state.cc

Index: components/subresource_filter/core/common/activation_state.cc
diff --git a/components/subresource_filter/core/common/activation_state.cc b/components/subresource_filter/core/common/activation_state.cc
new file mode 100644
index 0000000000000000000000000000000000000000..43e75137a7de50eda6d73a330c62cb21a8804118
--- /dev/null
+++ b/components/subresource_filter/core/common/activation_state.cc
@@ -0,0 +1,31 @@
+// 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.
+
+#include "components/subresource_filter/core/common/activation_state.h"
+
+#include <ostream>
+#include <sstream>
+#include <string>
+
+#include "base/memory/ptr_util.h"
+#include "base/trace_event/trace_event_argument.h"
+
+namespace subresource_filter {
+
+std::unique_ptr<base::trace_event::TracedValue> ActivationState::ToTracedValue()
+    const {
+  auto value = base::MakeUnique<base::trace_event::TracedValue>();
+  std::ostringstream level;
+  level << this;
+  value->SetString("activation_level", level.str());
+  value->SetBoolean("filtering_disabled_for_document",
+                    filtering_disabled_for_document);
+  value->SetBoolean("generic_blocking_rules_disabled",
+                    generic_blocking_rules_disabled);
+  value->SetBoolean("measure_performance", measure_performance);
+  value->SetBoolean("enable_logging", enable_logging);
+  return value;
+}
+
+}  // namespace subresource_filter