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This CL is replacing the hardcoded list of parens with a call to the
ICU API to get the codepoints attributes.

Splitting a run on brackets has the side-effect to ensures each
bracket (matching bracket) is rendered with the same font. This
avoid visual mismatch. The code to split text runs on brackets
was introduced to fix this:
  https://bugs.chromium.org/p/chromium/issues/detail?id=396776

Unittests are added with some codepoints that were not included as
brackets and should have been.

Bug: 995789
Change-Id: I268cc62604d755d61da2c87dd597aabfc57b7ef6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881723Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709987}