The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6f2691cc7756d599ce5622cb7c9fc854afcf3c57

commit 6f2691cc7756d599ce5622cb7c9fc854afcf3c57
Author: tdresser <tdresser@chromium.org>
Date: Wed Jun 28 17:53:34 2017

chrome://profiler infrastructure uses base time types.

Previously, chrome://profiler avoided base::TimeTicks and
base::TimeDelta because they're 64 bits.

At this point, that appears to be premature optimization. Switch to
using the base time types.

This is required for using chrome://profiler's infrastructure for
building thread time UMA metrics.

BUG= 736449 

Review-Url: https://codereview.chromium.org/2956683002
Cr-Commit-Position: refs/heads/master@{#483054}

[modify] https://crrev.com/6f2691cc7756d599ce5622cb7c9fc854afcf3c57/base/BUILD.gn
[modify] https://crrev.com/6f2691cc7756d599ce5622cb7c9fc854afcf3c57/base/debug/task_annotator.cc
[modify] https://crrev.com/6f2691cc7756d599ce5622cb7c9fc854afcf3c57/base/profiler/scoped_profile.h
[delete] https://crrev.com/a39debfb48a8b333cd989cfe1ff1649e39cd2fa7/base/profiler/tracked_time.cc
[delete] https://crrev.com/a39debfb48a8b333cd989cfe1ff1649e39cd2fa7/base/profiler/tracked_time.h
[delete] https://crrev.com/a39debfb48a8b333cd989cfe1ff1649e39cd2fa7/base/profiler/tracked_time_unittest.cc
[modify] https://crrev.com/6f2691cc7756d599ce5622cb7c9fc854afcf3c57/base/threading/worker_pool_posix.cc
[modify] https://crrev.com/6f2691cc7756d599ce5622cb7c9fc854afcf3c57/base/tracked_objects.cc
[modify] https://crrev.com/6f2691cc7756d599ce5622cb7c9fc854afcf3c57/base/tracked_objects.h
[modify] https://crrev.com/6f2691cc7756d599ce5622cb7c9fc854afcf3c57/base/tracked_objects_unittest.cc
[modify] https://crrev.com/6f2691cc7756d599ce5622cb7c9fc854afcf3c57/base/tracking_info.h
[modify] https://crrev.com/6f2691cc7756d599ce5622cb7c9fc854afcf3c57/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc

We're punting this for now.