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This is a reland of d9dbade3

Original change's description:
> [Traffic Annotations] Run extractor.py on waterfall
> 
> linux-annotator-rel and win-annotator-rel will now test traffic
> annotations with extractor.py, as well as the clang tool.
> 
> Also updates a traffic annotation in management_ui_handler.cc, since
> extractor.py doesn't understand #ifdefs. As a workaround, this
> CrOS-specific annotation is moved to a CrOS-only file.
> 
> TESTED=
>   Ran traffic_annotation_auditor_tests.py locally, excluding the
>   --no-filtering configs.
> 
> Bug: 966883
> Change-Id: I7848877f67635b50d8ce2a841019e49136a33b11
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1692970
> Reviewed-by: Hector Carmona <hcarmona@chromium.org>
> Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
> Commit-Queue: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#675994}

Bug: 966883
Change-Id: I5d3275315565b0592c86feedb564fa5cbf154e4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761146Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688597}