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The StyledLabel calls two different ctors of Label based on the styled
range, one with |custom_font| and the other one with |text_style|. The
two ctors will create labels with different heights, which causes a
misalignment between normal and bold texts.

This cl adds an ash typography to support semi bold text style to
emphasize a matched search string. Then the label in the styled range
will call a same ctor of Label with |text_style| to eliminate the
difference.

Bug: 1061271
Test: New unittest
Change-Id: I5b7415ef3b7bd06c5ad296fe9e5211ddd18685ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2108061
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751222}