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Thumbnail sizes will soon be dynamic. WebUITabStripContainerView will
need to resize itself when they change, so it needs to know how the tab
strip will be layed out. This CL adds layout calculation logic in
C++-side code so both the tab strip and the WebUITabStripContainerView
can use it.

Bug: 1013646
Change-Id: If45238985e304ec42721a96518b7f1afc264f256
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872784
Commit-Queue: Collin Baker <collinbaker@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708866}