Fully enable about:tracking by default

base/tracking_info.cc

Index: base/tracking_info.cc
===================================================================
--- base/tracking_info.cc	(revision 0)
+++ base/tracking_info.cc	(revision 0)
@@ -0,0 +1,23 @@
+// Copyright (c) 2011 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/tracking_info.h"
+
+#include "base/tracked_objects.h"
+
+namespace base {
+
+TrackingInfo::TrackingInfo(
+    const tracked_objects::Location& posted_from,
+    base::TimeTicks delayed_run_time)
+    : birth_tally(
+          tracked_objects::ThreadData::TallyABirthIfActive(posted_from)),
+      time_posted(TimeTicks::Now()),
+      delayed_run_time(delayed_run_time) {
+}
+
+TrackingInfo::~TrackingInfo() {}
+
+}  // namespace base
+