tracing: split trace event filter classes out of TraceLog

base/trace_event/trace_event_filter_test_utils.cc

Index: base/trace_event/trace_event_filter_test_utils.cc
diff --git a/base/trace_event/trace_event_filter_test_utils.cc b/base/trace_event/trace_event_filter_test_utils.cc
new file mode 100644
index 0000000000000000000000000000000000000000..dbda25d6c5e2f8da2821adef800aaf9d544cbd81
--- /dev/null
+++ b/base/trace_event/trace_event_filter_test_utils.cc
@@ -0,0 +1,30 @@
+// 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/trace_event_filter_test_utils.h"
+
+namespace base {
+namespace trace_event {
+
+// static
+const char TestEventFilter::kName[] = "testing_predicate";
+size_t TestEventFilter::filter_trace_event_hit_count_ = 0;
+size_t TestEventFilter::end_event_hit_count_ = 0;
+bool TestEventFilter::filter_return_value_ = false;
+
+TestEventFilter::TestEventFilter() {}
+TestEventFilter::~TestEventFilter() {}
+
+bool TestEventFilter::FilterTraceEvent(const TraceEvent& trace_event) const {
+  filter_trace_event_hit_count_++;
+  return filter_return_value_;
+}
+
+void TestEventFilter::EndEvent(const char* category_name,
+                               const char* name) const {
+  end_event_hit_count_++;
+}
+
+}  // namespace trace_event
+}  // namespace base