[OBSOLETE] tracing: split trace event filter logic out of TraceLog

base/trace_event/event_name_filter.cc

Index: base/trace_event/event_name_filter.cc
diff --git a/base/trace_event/event_name_filter.cc b/base/trace_event/event_name_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3697baf28e56d35b7adff69ad2546d9d2eabb6eb
--- /dev/null
+++ b/base/trace_event/event_name_filter.cc
@@ -0,0 +1,35 @@
+// 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.
+
+#include "base/trace_event/event_name_filter.h"
+
+#include "base/debug/stack_trace.h"
+#include "base/trace_event/trace_event_impl.h"
+
+namespace base {
+namespace trace_event {
+
+// static
+const char EventNameFilter::kName[] = "event_whitelist_predicate";
+
+EventNameFilter::EventNameFilter()
+    : event_names_whitelist_(new EventNamesWhitelist()) {}
+
+EventNameFilter::~EventNameFilter() {}
+
+void EventNameFilter::SetWhitelistedEventNames(
+    std::unique_ptr<EventNamesWhitelist> event_names_whitelist) {
+  event_names_whitelist_ = std::move(event_names_whitelist);
+}
+
+bool EventNameFilter::FilterTraceEvent(const TraceEvent& trace_event) const {
+  return event_names_whitelist_->count(trace_event.name()) != 0;

[ssid, 2016/11/16 10:19:44]

This is not thread safe. All threads will access the event_names_whitelist_
without lock when a TRACE_EVENT is hit. If filtering is enabled twice with
EventNameFilter then this list is changed and trace events could be accessing
the list.

+}
+
+const char* EventNameFilter::name() const {
+  return kName;
+}
+
+}  // namespace trace_event
+}  // namespace base