We actually can do both at the same time. i.e: enabling trace while running the animometr/motionmark & pull out the Animometer score as the same time as thread_times metrics score computed using the trace. 
However, we would need someone's help to port thread_times metrics to use tbm2 framework.

Because of the tests' adaptive nature in benchmarking mode, getting thread_times in benchmarking mode is low priority for me.

FYI: animometer-inspired canvas cases were added with this CL: https://codereview.chromium.org/2047773002/

@#2: Due to the adaptive nature of the benchmarks, they were modified to make them into fixed-complexity animation loops, which is more appropriate for telemetry smoothness tests.

 Issue 616273  has been merged into this issue.

This is on hold until we make progress on updating smoothness metrics to TBMv2 and harness and reducing overall smoothness benchmark cycle times.

The benchmark set-up code is here https://codereview.chromium.org/2771343003/ for when we're ready.

For now you can still put it in tools/perf/contrib/ directory if you want to be able to run the benchmark locally or kick off trybot

This was blocked from landing before, but we keep regressing these benchmarks and need to get them on the waterfall.  Picking this up again.

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/1775a4b7640000

📍 Job complete. See results below.
https://pinpoint-dot-chromeperf.appspot.com/job/1775a4b7640000

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/17c15c44e40000

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3e400a746ec659116c6f381fadbf5f4938131475

commit 3e400a746ec659116c6f381fadbf5f4938131475
Author: Victor Miura <vmiura@chromium.org>
Date: Thu Sep 27 16:24:32 2018

Rendering benchmarks based on MotionMark HTML and SVG tests.

These tests run MotionMark with fixed complexity sufficient to
saturate most mobile phones today.  Excludes Canvas tests which
are already included in other story sets.

BUG=619680

Change-Id: Id199dc6d7c5d497941c33405a069de6a9fc26980
Reviewed-on: https://chromium-review.googlesource.com/1244544
Commit-Queue: Victor Miura <vmiura@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594746}
[modify] https://crrev.com/3e400a746ec659116c6f381fadbf5f4938131475/tools/perf/benchmark.csv
[modify] https://crrev.com/3e400a746ec659116c6f381fadbf5f4938131475/tools/perf/page_sets/data/rendering_mobile.json
[add] https://crrev.com/3e400a746ec659116c6f381fadbf5f4938131475/tools/perf/page_sets/data/rendering_mobile_089f7a2710.wprgo.sha1
[add] https://crrev.com/3e400a746ec659116c6f381fadbf5f4938131475/tools/perf/page_sets/data/rendering_mobile_f7f3ea1d6e.wprgo.sha1
[add] https://crrev.com/3e400a746ec659116c6f381fadbf5f4938131475/tools/perf/page_sets/data/rendering_mobile_f86ce4f9f0.wprgo.sha1
[add] https://crrev.com/3e400a746ec659116c6f381fadbf5f4938131475/tools/perf/page_sets/rendering/motionmark.py
[modify] https://crrev.com/3e400a746ec659116c6f381fadbf5f4938131475/tools/perf/page_sets/rendering/story_tags.py
[modify] https://crrev.com/3e400a746ec659116c6f381fadbf5f4938131475/tools/perf/page_sets/rendering/tough_filters_cases.py

📍 Job complete. See results below.
https://pinpoint-dot-chromeperf.appspot.com/job/17c15c44e40000