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Ensure that <histogram> should be added in <hisotgrams> and
<histogram_suffixes> should be added in <histogram_suffixes_list> so
that they will be sorted separately.

Bug: 1034123
Change-Id: Iaf009dacf20a549f6e5865a4a699bb3919e96082
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1978539
Commit-Queue: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728635}