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Currently, we parse the two values in scroll-snap-align for x and y.
However, according to the spec,
https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-align, the two
values specify the alignment in the inline axis and block axis. This
patch renames the two values and handles the vertical writing mode for
inline and block alignments.

Bug: 821645
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I78acff0df4698b3f9c0f7443e61e3bad75379b14
Reviewed-on: https://chromium-review.googlesource.com/967890
Commit-Queue: Sandra Sun <sunyunjia@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Ali Juma <ajuma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544055}