All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=830805

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=393f05145cbc74b874dc54eb6c5601ab4b16b46f2520b1ce631fc4f0c1bc7378


Bot(s) for this bug's original alert(s):

linux-release

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/15052414c40000

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/12ee7133c40000

📍 Found a significant difference after 1 commit.
https://pinpoint-dot-chromeperf.appspot.com/job/12ee7133c40000

Enable presentation feedback on Linux by penghuang@chromium.org
https://chromium.googlesource.com/chromium/src/+/400c1e296933da71f3b4e3a04b0843297dd4ffa4

Understanding performance regressions:
  http://g.co/ChromePerformanceRegressions

This CL has been reverted. After that, I landed several CLs which address the regression. And then I re-landed the CL to enable presentation feedback on Linux, and didn't observed the regression till now. So mark it as fixed.
The re-land change: is 556299

https://chromium.googlesource.com/chromium/src/+/3cadd73f42b57196f515bd4be68b1105b4716d1b

commit	3cadd73f42b57196f515bd4be68b1105b4716d1b	[log] [tgz]
author	Peng Huang <penghuang@chromium.org>	Sat May 05 03:06:58 2018
committer	Commit Bot <commit-bot@chromium.org>	Sat May 05 03:06:58 2018
tree	36bdd6207a8608656fccb0710648ea64def389fd
parent	ed101dbb3bff2d0ff1a8ae93d5713f173f0dd0a0 [diff]
Reland "Turn on presentation feedback for Linux"

This is a reland of 66531351cdf16d4af18513c3a304bdd526c2dc94

Original change's description:
> Turn on presentation feedback for Linux
>
> Bug:  776877 
> Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
> Change-Id: I9d9590a5174db94392a447ab280e9218b37c2958
> Reviewed-on: https://chromium-review.googlesource.com/1040725
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Commit-Queue: Peng Huang <penghuang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#555782}

TBR=piman@chromium.org

Bug:  776877 
Change-Id: I7b8c4cdfd05b39d0c5bfa39c884775183564b35e
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/1045845
Commit-Queue: Peng Huang <penghuang@chromium.org>
Reviewed-by: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556299}