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The calculation of default window size is based on fixing width to 764px
in all preview aspect ratio cases(3:4, 4:3, 9:16, 16:9) and deriving
height from that fixed width so that after preserve space for left,
right, bottom icons(--xxx-line*2), the |#preview-box| can fit in preview
aspect ratio as close as possible. After these, the new default window
size under different preview aspect ratio will be: 3:4 -> 764x888; 4:3
-> 764x552; 9:16 -> 764x1144; 16:9 -> 764x444. Also change the minimal
window width x height to 486 x 444 accordingly.

Bug: b/175324385
Test: Manually verify default window size under 3:4, 4:3, 9:16, 16:9
preview.

Change-Id: Ic4c569819f29b813029f478e6920f66453ab4792
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2615730Reviewed-by: Shik Chen <shik@chromium.org>
Commit-Queue: Inker Kuo <inker@chromium.org>
Auto-Submit: Inker Kuo <inker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843399}