pull constant out of trace_event_impl for split_link

base/debug/trace_event_impl_constants.cc

Index: base/debug/trace_event_impl_constants.cc
diff --git a/base/debug/trace_event_impl_constants.cc b/base/debug/trace_event_impl_constants.cc
new file mode 100644
index 0000000000000000000000000000000000000000..71e9e08db78ee843c482792d65fbe8c89ed28e64
--- /dev/null
+++ b/base/debug/trace_event_impl_constants.cc
@@ -0,0 +1,14 @@
+// Copyright (c) 2013 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/debug/trace_event_impl.h"
+
+namespace base {
+namespace debug {
+
+// Enable everything but debug and test categories by default.
+const char* CategoryFilter::kDefaultCategoryFilterString = "-*Debug,-*Test";
+
+}  // namespace debug
+}  // namespace base