Bisected to e05ba4c58bde7423528fbb71f61b74543bae919c
"Reland "Draw Occlusion: Enable Draw Occlusion by Default""
Landed in 67.0.3383.0
Confirmed by disabling the CL via "--disable-features=DrawOcclusion" and observing the bug is gone.

To find the underlying bug "--enable-features=DrawOcclusion --enable-draw-occlusion" was used:
Bisect info: 510929 (good) - 510942 (bad)
https://chromium.googlesource.com/chromium/src/+log/03bf954e..bdfa9a0b?pretty=fuller
Suspecting r510942 = bdfa9a0b9a8f7e5704d479d957fe25d675aea4be = https://crrev.com/c/711391 by yiyix@chromium.org
"Optimize overdraw on partially overlapped windows"
Landed in 64.0.3248.0 under chrome://flags/#enable-draw-occlusion

Able to reproduce the issue on reported chrome version 67.0.3393.4 and on the latest canary 68.0.3399.0 using Windows 10, Ubuntu 14.04 and Mac 10.12.6

Bisect Information:
===================
Last Good Build: 67.0.3382.0
First Bad Build: 67.0.3383.0

Suspecting the same from comment#1
https://chromium.googlesource.com/chromium/src/+/bdfa9a0b9a8f7e5704d479d957fe25d675aea4be

Review URL: https://chromium-review.googlesource.com/711391

Note: Adding RB-Stable as this seems to be a recent regression, please remove if not required.

@yiyix: Please help in assigning it to the right owner if this is not related to your change.

Thanks!

M67 Stable promotion is coming soon. Your bug is labelled as Stable ReleaseBlock, pls make sure to land the fix and request a merge into the release branch ASAP. Thank you.

Assigning to correct owner.

*** Bulk Edit ***
M67 Stable promotion is coming soon. Your bug is labelled as Stable ReleaseBlock, pls make sure to land the fix and request a merge into the release branch ASAP. 

If fix is already merged to M67 and nothing else is pending, pls mark the bug as fixed. Thank you.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7a297c386d902914c424f0a75f74478eb44b1186

commit 7a297c386d902914c424f0a75f74478eb44b1186
Author: yiyix <yiyix@chromium.org>
Date: Sat May 05 08:25:20 2018

Fix regression: 3D objects are not shown correctly

The current draw occlusion cannot handle 3d object yet. This patch allows
DrawOcclusion to skip draw quads from a 3D objects.

Bug:  833748 
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I08d12c794d4acff0e1f584f4c74857bc5df83fee
Reviewed-on: https://chromium-review.googlesource.com/1044781
Commit-Queue: Yi Xu <yiyix@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556323}
[modify] https://crrev.com/7a297c386d902914c424f0a75f74478eb44b1186/components/viz/service/display/display.cc
[modify] https://crrev.com/7a297c386d902914c424f0a75f74478eb44b1186/components/viz/service/display/display_unittest.cc

*** Bulk Edit ***
M67 Stable promotion is coming VERY soon. Your bug is labelled as Stable ReleaseBlock, pls make sure to land the fix and request a merge into the release branch ASAP. 

If fix is already merged to M67 and nothing else is pending, pls mark the bug as fixed. Thank you.

The bug is fixed, could anyone verify that it is fixed? So that i can merge to M67?

Thanks.

This bug requires manual review: M67 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), kbleicher@(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

>could anyone verify that it is fixed? 

Verified in r556421.

Deleted: r556421 good.png 92.0 KB

	r556421 good.png 92.0 KB View Download

How is the change listed at #7 looking in canary?

Canary is same as r556421.
It's just that Canary has font rendering so broken that I didn't want to post a screenshot from there so I chose a more recent build that has fonts fixed.

The NextAction date has arrived: 2018-05-08

Able to reproduce this issue on reported version 67.0.3393.4, hence verifying the fix on latest canary 68.0.3424.0 using Windows 10, Mac 10.12.6 and Ubuntu 14.04.

Now observing "front" on navigating to codepen given in comment#0.

As fix is working as expected adding TE-Verified labels.

Thanks! 

Deleted: 833748_68.0.3424.0.PNG 553 KB

	833748_68.0.3424.0.PNG 553 KB View Download

Approving merge to M67 branch 3396 based onc on comment #12 and #17. Pls merge ASAP so we can take it in for tomorrow's beta release. Thank you.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d72bb146bb3c9598aa025141cb660130a0e0443d

commit d72bb146bb3c9598aa025141cb660130a0e0443d
Author: yiyix <yiyix@chromium.org>
Date: Tue May 08 15:51:15 2018

Fix regression: 3D objects are not shown correctly

The current draw occlusion cannot handle 3d object yet. This patch allows
DrawOcclusion to skip draw quads from a 3D objects.

Bug:  833748 
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I08d12c794d4acff0e1f584f4c74857bc5df83fee
Reviewed-on: https://chromium-review.googlesource.com/1044781
Commit-Queue: Yi Xu <yiyix@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#556323}(cherry picked from commit 7a297c386d902914c424f0a75f74478eb44b1186)
Reviewed-on: https://chromium-review.googlesource.com/1050385
Reviewed-by: Yi Xu <yiyix@chromium.org>
Cr-Commit-Position: refs/branch-heads/3396@{#516}
Cr-Branched-From: 9ef2aa869bc7bc0c089e255d698cca6e47d6b038-refs/heads/master@{#550428}
[modify] https://crrev.com/d72bb146bb3c9598aa025141cb660130a0e0443d/components/viz/service/display/display.cc
[modify] https://crrev.com/d72bb146bb3c9598aa025141cb660130a0e0443d/components/viz/service/display/display_unittest.cc