For those following along 177031 was proposed as a way to provide an API to UI to "flatten" a subtree for animation. Its basically SetForceRenderSurface and then have the display compositor cache render surfaces so that they're cheaper than not using a render surface (without invalidations).

Adding myself to follow this bug.

Mikhail, any chance you would take this one over?

I started looking at this a couple of weeks back to understand what would need to happen. I think we are in a good place. There has been some recent work to add a 'Browser' devtools API that allows changing window states etc [1]. Although these are currently only used by chromedriver [2], I think we will be able to use this from catapult too.


[1] https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/inspector/browser_protocol.json?sq=package:chromium&dr&l=4666
[2] https://codereview.chromium.org/2826393002

For reference, CL implementing the 'Browser' devtools API: https://codereview.chromium.org/2813553005

I have started working on this.

The following revision refers to this bug:
  https://chromium.googlesource.com/catapult/+/1087227dc4f1b667ae1297562e95020f08c5baca

commit 1087227dc4f1b667ae1297562e95020f08c5baca
Author: Ehsan Chiniforooshan <chiniforooshan@chromium.org>
Date: Thu Nov 16 20:31:34 2017

telemetry: add window manager actions for CrOS

Same as
https://chromium-review.googlesource.com/c/chromium/src/+/660918,
but adding the new methods to the devtools client backend.

Manually tested on a chromebook and verified that we can enter/exit
overview mode using the action runner.

Bug: chromium:706860

Change-Id: I50bbf0848d2fc9b90cdc1d73277a56cdd52f6fb1
Reviewed-on: https://chromium-review.googlesource.com/758918
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Ehsan Chiniforooshan <chiniforooshan@chromium.org>

[modify] https://crrev.com/1087227dc4f1b667ae1297562e95020f08c5baca/telemetry/telemetry/internal/backends/chrome/cros_browser_backend.py
[modify] https://crrev.com/1087227dc4f1b667ae1297562e95020f08c5baca/telemetry/telemetry/internal/actions/action_runner_unittest.py
[modify] https://crrev.com/1087227dc4f1b667ae1297562e95020f08c5baca/telemetry/telemetry/internal/backends/browser_backend.py
[modify] https://crrev.com/1087227dc4f1b667ae1297562e95020f08c5baca/telemetry/telemetry/internal/actions/action_runner.py
[add] https://crrev.com/1087227dc4f1b667ae1297562e95020f08c5baca/telemetry/telemetry/internal/backends/chrome_inspector/window_manager_backend.py
[modify] https://crrev.com/1087227dc4f1b667ae1297562e95020f08c5baca/telemetry/telemetry/internal/browser/browser.py
[modify] https://crrev.com/1087227dc4f1b667ae1297562e95020f08c5baca/telemetry/telemetry/internal/backends/chrome_inspector/devtools_client_backend.py

Removing as a blocker for 731255 and instead we'll track the time it takes for events to be processed (798775) as well as time to initial present (792214).

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/5a6deddca2a2dac34ed7c075c802ebd1ba6730de

commit 5a6deddca2a2dac34ed7c075c802ebd1ba6730de
Author: wutao <wutao@chromium.org>
Date: Fri Mar 02 21:25:09 2018

Add benchmark: cros_ui_smoothness

The patch adds one benchmark: cros_ui_smoothness.
1. Add it to ON_DUT_WHITE_LIST.
2. Add it to PERF_DAILY_RUN_TESTS.
3. Add it to ChromeOSPerf perf dashboard.

Bug: 706860
Test: can run the test by tools/perf/run_benchmark cros_ui_smoothness.
Change-Id: I97f60ae4f3189a9cd8d835f3b59ec3fa67496372
Reviewed-on: https://chromium-review.googlesource.com/943937
Commit-Ready: Tao Wu <wutao@chromium.org>
Tested-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Chung-yih Wang <cywang@chromium.org>

[add] https://crrev.com/5a6deddca2a2dac34ed7c075c802ebd1ba6730de/server/site_tests/telemetry_Benchmarks/control.cros_ui_smoothness
[modify] https://crrev.com/5a6deddca2a2dac34ed7c075c802ebd1ba6730de/server/cros/telemetry_runner.py
[modify] https://crrev.com/5a6deddca2a2dac34ed7c075c802ebd1ba6730de/tko/perf_upload/perf_dashboard_config.json
[modify] https://crrev.com/5a6deddca2a2dac34ed7c075c802ebd1ba6730de/server/site_tests/telemetry_Benchmarks/generate_controlfiles.py

sky@, you mentioned this in an email thread recently. Not sure what is the latest plan for this.
I will remove myself as the owner for now.

Oshima is going to take this on.