This test was already broken, and is now in fact improved from previous behavior. From the test:

 Verify default overflow rules on foreignObject
 You should see a 300x300 green rectangle at 100x100 and no scrollbars.

 NOTE: This is currently BROKEN in WebKit. We're clipping the viewport of <foreignObject> correctly,
       though for each positioned object a Layer is created, that has no knownledge of the
       size of the <foreignObject> viewport - as <foreignObject> doesn't create a Layer.
       So for now, you'll see an unclipped content area, just as if overflow was visible.

The test was added 7 years ago in:

https://chromium.googlesource.com/chromium/src/+/2d18ee90d8954e0111916a4e7786d13aa38ea7b8

It appears implementation of clipping for foreign objects has never been fully completed per
above comment.

This bug should not block shipping visual rect rtrees in cc. IMO we should rebaseline the test
and leave this bug open to track completing the feature work.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c5d5747f55102dba020cbce7ee9e9c65dc4e22bf

commit c5d5747f55102dba020cbce7ee9e9c65dc4e22bf
Author: wkorman <wkorman@chromium.org>
Date: Wed Aug 24 00:51:31 2016

Rebaseline overflow-on-foreignObject.svg to reflect altered visual rect behavior.

BUG= 640272 
TBR=pdr

Review-Url: https://codereview.chromium.org/2269963004
Cr-Commit-Position: refs/heads/master@{#413913}

[modify] https://crrev.com/c5d5747f55102dba020cbce7ee9e9c65dc4e22bf/third_party/WebKit/LayoutTests/TestExpectations

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a4c76cdc1a211bd264d4eccf40358234e4f4e6c3

commit a4c76cdc1a211bd264d4eccf40358234e4f4e6c3
Author: Rebaseline Bot <blink-rebaseline-bot@chromium.org>
Date: Wed Aug 24 02:18:36 2016

Auto-rebaseline for r413913

https://chromium.googlesource.com/chromium/src/+/c5d5747f5

BUG= 640272 
TBR=wkorman@chromium.org

Review URL: https://codereview.chromium.org/2270103003 .

Cr-Commit-Position: refs/heads/master@{#413943}

[modify] https://crrev.com/a4c76cdc1a211bd264d4eccf40358234e4f4e6c3/third_party/WebKit/LayoutTests/TestExpectations
[add] https://crrev.com/a4c76cdc1a211bd264d4eccf40358234e4f4e6c3/third_party/WebKit/LayoutTests/platform/android/svg/overflow/overflow-on-foreignObject-expected.png
[delete] https://crrev.com/8d1974aecc77d407a9ee89d2434f0079b4cc1e40/third_party/WebKit/LayoutTests/platform/mac/svg/overflow/overflow-on-foreignObject-expected.png
[modify] https://crrev.com/a4c76cdc1a211bd264d4eccf40358234e4f4e6c3/third_party/WebKit/LayoutTests/svg/overflow/overflow-on-foreignObject-expected.png

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available. If you change it back, also remove the "Hotlist-Recharge-Cold" label.

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