Enable tracking of objects by default

This is a reland of accumulated patches including CLs
8414036, 8425010, 8425013, 8424013.

It fully enables tracking of objects, as seen in about:tracking
in teh release build.

The problem this had in its initaial landing centered on
Mac instability in base_unittest.  We were encountering crash
on exit of the tests, with a stack dump involving pthreads.


r=rtenneti
BUG=101856
Review URL: http://codereview.chromium.org/8429009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@108026 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 41 insertions, 0 deletions

diff --git a/base/tracking_info.h b/base/tracking_info.h
new file mode 100644
index 0000000..0886fdf
--- /dev/null
+++ b/base/tracking_info.h
@@ -0,0 +1,41 @@
+// 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.
+
+// This is a simple struct with tracking information that is stored
+// with a PendingTask (when message_loop is handling the task).
+// Only the information that is shared with the profiler in tracked_objects
+// are included in this structure.
+
+
+#ifndef BASE_TRACKING_INFO_H_
+#define BASE_TRACKING_INFO_H_
+
+#include "base/time.h"
+
+namespace tracked_objects {
+class Location;
+class Births;
+}
+
+namespace base {
+
+// This structure is copied around by value.
+struct BASE_EXPORT TrackingInfo {
+  TrackingInfo(const tracked_objects::Location& posted_from,
+               base::TimeTicks delayed_run_time);
+  ~TrackingInfo();
+
+  // Record of location and thread that the task came from.
+  tracked_objects::Births* birth_tally;
+
+  // Time when the related task was posted.
+  base::TimeTicks time_posted;
+
+  // The time when the task should be run.
+  base::TimeTicks delayed_run_time;
+};
+
+}  // namespace base
+
+#endif  // BASE_TRACKING_INFO_H_