The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/830b21927c2ad4ad9982d4b261d4eb3d4ab68451

commit 830b21927c2ad4ad9982d4b261d4eb3d4ab68451
Author: Paul Irish <paulirish@chromium.org>
Date: Thu Jul 20 04:26:32 2017

DevTools: Move Audits2 report selection from TreeOutline -> ComboBox


Bug:  745958 
Change-Id: I87c0de5d5c7e9d5fc8b6fd38d95dec8013934db8
Reviewed-on: https://chromium-review.googlesource.com/576359
Commit-Queue: Paul Irish <paulirish@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488136}
[modify] https://crrev.com/830b21927c2ad4ad9982d4b261d4eb3d4ab68451/third_party/WebKit/Source/devtools/BUILD.gn
[modify] https://crrev.com/830b21927c2ad4ad9982d4b261d4eb3d4ab68451/third_party/WebKit/Source/devtools/front_end/Images/largeIcons.png
[modify] https://crrev.com/830b21927c2ad4ad9982d4b261d4eb3d4ab68451/third_party/WebKit/Source/devtools/front_end/Images/largeIcons_2x.png
[add] https://crrev.com/830b21927c2ad4ad9982d4b261d4eb3d4ab68451/third_party/WebKit/Source/devtools/front_end/Images/readme.md
[modify] https://crrev.com/830b21927c2ad4ad9982d4b261d4eb3d4ab68451/third_party/WebKit/Source/devtools/front_end/Images/src/largeIcons.svg
[modify] https://crrev.com/830b21927c2ad4ad9982d4b261d4eb3d4ab68451/third_party/WebKit/Source/devtools/front_end/Images/src/svg2png.hashes
[modify] https://crrev.com/830b21927c2ad4ad9982d4b261d4eb3d4ab68451/third_party/WebKit/Source/devtools/front_end/audits2/Audits2Panel.js
[delete] https://crrev.com/1c955f0530f6fe3f0f5bfdbe071d0c680a615b99/third_party/WebKit/Source/devtools/front_end/audits2/audits2Tree.css
[modify] https://crrev.com/830b21927c2ad4ad9982d4b261d4eb3d4ab68451/third_party/WebKit/Source/devtools/front_end/audits2/module.json
[modify] https://crrev.com/830b21927c2ad4ad9982d4b261d4eb3d4ab68451/third_party/WebKit/Source/devtools/front_end/ui/Icon.js
[modify] https://crrev.com/830b21927c2ad4ad9982d4b261d4eb3d4ab68451/third_party/WebKit/Source/devtools/front_end/ui/Toolbar.js

@paulirish: Could you please provide us the sample repro steps to check the issue from our end?

Thanks!!