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This accounts for additional internal padding which is present for
leading/trailing buttons when maximized / in fullscreen.

Bug: None
Change-Id: If6841101172316174d2bce5b6091d2f31e9f197b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903652
Commit-Queue: Peter Boström <pbos@chromium.org>
Commit-Queue: Caroline Rising <corising@chromium.org>
Auto-Submit: Peter Boström <pbos@chromium.org>
Reviewed-by: Caroline Rising <corising@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713493}