Chrome Version : 63.0.3239.84 (Official Build) 8f51ed0e633e109109762a3deb18a50e8c138819-refs/branch-heads/3239@{#643} 64-bit
OS : Mac(10.12.6) (10.13.2)

Precondition : Please enable ‘Force UI direction’ and ‘Enable RTL’ flags from chrome://flags.

What steps will reproduce the problem?
1. Launch chrome, enable ‘Force UI direction’ and ‘Enable RTL’ flags and restart the browser.
2. Open 7 to 8 NTP and observe the browser’s ‘Minimise’ and ‘Full screen’ button. (Kindly review an attached screen cast)

Actual Result : ‘New tab’ button overlaps with ‘Minimise’ and ‘Full screen’ button in RTL mode.

Expected Result : ‘New tab’ button should not overlap with ‘Minimise’ and ‘Full screen’ button in RTL mode.

This is a regression issue broken in ‘M-62’ and using the per-revision bisect providing the bisect results,
Good build : 62.0.3180.0 (Revision : 492770)
Bad build : 62.0.3181.0 (Revision : 493197)

You are probably looking for a change made after 492971 (known good), but no later than 492972 (first known bad).

CHANGELOG URL:
https://chromium.googlesource.com/chromium/src/+log/d5ea6ad9b7b5af521c634c6461227c619b6728a1..1f71c6ec3d33ac53f8e2474fbfd9e6396f731008

Suspect : https://chromium.googlesource.com/chromium/src/+/1f71c6ec3d33ac53f8e2474fbfd9e6396f731008

@sdy : Could you please look into the issue, pardon me if it has nothing to do with your changes and if possible please assign it to concern owner.

Note : This is Mac OS specific issue and the same is not reproducible on Windows(7,8,10) and Linux(14.04 LTS) OS
 

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Actual_Result.mov 7.3 MB Download

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Expected_Result.mov 9.6 MB Download