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Add support for the values "jis-b5" and "jis-b4" in the "size" property
of the "@page" rule, as specified in the CSS standard:

https://www.w3.org/TR/css-page-3/#typedef-page-size-page-size

These values represent two Japanese standard paper sizes:
  - JIS B5 is 182mm wide by 257mm high
  - JIS-B4 is 257mm wide by 364mm high

Test: printing/page-format-data.html

Bug: 1047642
Change-Id: Iec39bb535d21ea5a6ee1696b744166e1247be35f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2059029Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743031}