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Next to suggestive and input chips, there are assistive chips which
perform more sophisticated actions (like autofilling the whole page).

This CL doesn't change:
- input chips (e.g. in accessory sheet)
- suggestive chips (e.g. in Downloads header)

This CL adds:
- styles for assistive chips
- a secondary text used in assistive chips
- a consumer (autofill chips) using assistive chips

Minor fix:
- RTL support for accessory sheets (wrong padding uncovered by this CL)
- allow setting untinted icons

Autofill suggestions before this CL:
https://photos.app.goo.gl/9GxKMy4oeCyKcbgY9

Autofill suggestions with this CL:
https://photos.app.goo.gl/5qPEdXWbA4jxbyVZ6

Autofill suggestions with follow-up (using secondary text and icons):
https://photos.app.goo.gl/nMVp3jxnGULSLLtd7

Autofill chip mocks:
http://slides/1f8LgG2PgUTXJWgXSO2Y9yOhYDKTmkGv1f27_KYb7ICQ#slide=id.g4c6efbd9b1_0_51

Bug: 853772
Change-Id: I08b2f22c77f21376b998188da145c63c188befb9
Reviewed-on: https://chromium-review.googlesource.com/c/1430012
Commit-Queue: Friedrich [CET] <fhorschig@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626489}