Update generation dialog layout to match specs

This CL:
- Adds 24dp spacing in between the generated password text view and the
explanation text view.
- Changes the padding of the generation dialog's custom view layout
to 24dp.
- Changes the text line height to 20sp.
- Changes the appearance of the generated password text.

Bug: 835234
Change-Id: I4e9a683298674ab81e67fb08c39a9d5dcdd3e3b3
Reviewed-on: https://chromium-review.googlesource.com/1138327
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Ioana Pandele <ioanap@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575580}
3 files changed