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This CL modify the spacing to taking 1/3 of the available space if we
have a small screen or in portrait mode, 1/5 if we have large screen.

Bug: 1011641
Change-Id: I97020a650f416c9976eb5a9ab32b038a9338ba53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865553Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Jazz Xu <jazzhsu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706670}