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In RTL case, the coordinate system is from right to left and the origin is the right upper corner. The coordinates for everything on the lock screen should be the same in both LTR and RTL cases and therefor mirroring is not needed.

The misplacement is due to doing mirroring in `ConvertPointToTarget` when finding the position of the bubble. We need to remove the mirroring effect in order to find the correct position for login bubble.

Bug: 937245
Change-Id: I4c4ce54ab7617a5c4c56e861afb7a103b045ef8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505869
Commit-Queue: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Roman Aleksandrov <raleksandrov@google.com>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822175}