The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/403ac1400f04a1a924811cf8515046ad58e73013

commit 403ac1400f04a1a924811cf8515046ad58e73013
Author: newcomer <newcomer@chromium.org>
Date: Wed Jul 05 18:26:30 2017

Added flag in chrome://flags to enable the New Launcher UI.

BUG= 738573 

Review-Url: https://codereview.chromium.org/2965813002
Cr-Commit-Position: refs/heads/master@{#484314}

[modify] https://crrev.com/403ac1400f04a1a924811cf8515046ad58e73013/chrome/browser/about_flags.cc
[modify] https://crrev.com/403ac1400f04a1a924811cf8515046ad58e73013/chrome/browser/flag_descriptions.cc
[modify] https://crrev.com/403ac1400f04a1a924811cf8515046ad58e73013/chrome/browser/flag_descriptions.h
[modify] https://crrev.com/403ac1400f04a1a924811cf8515046ad58e73013/tools/metrics/histograms/enums.xml
[modify] https://crrev.com/403ac1400f04a1a924811cf8515046ad58e73013/ui/app_list/app_list_features.cc
[modify] https://crrev.com/403ac1400f04a1a924811cf8515046ad58e73013/ui/app_list/app_list_switches.cc
[modify] https://crrev.com/403ac1400f04a1a924811cf8515046ad58e73013/ui/app_list/app_list_switches.h

Verified on build 9756.0.0