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Currently the TabStripRegionView controls are flush with the window's
caption buttons on Windows, Linux and ChromeOS and sitting flush with
the browser window itself on Mac.

This CL introduces an 8pt padding to the TabStripRegionView when tab
strip controls are present in keeping with UX guidance. Presently the
only applicable control is the TabSearchBubtton.

This introduces the desired spacing between window caption buttons
and right aligned controls. It also correctly aligns the rightmost
control over the 3 dot menu in the toolbar on Mac.

Bug: 1145277
Change-Id: Ic199b7f21f158723559d82dc37046ff463ae6c51
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522167Reviewed-by: Taylor Bergquist <tbergquist@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826152}