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This CL is the second part of an effort to port the existing Desktop
feature to Android. This feature enables a user to send an image to
Google to process to generate a descriptive alt text if a website
does not provide one.

Design Doc: go/2020-q1-android-image-descriptions
Slide Deck: go/clank-imageDescriptions
Launch Bug: 1057168

Original Desktop Design Doc for reference:
go/chrome-a11y-annotations-design

This is a conservative approach, we use a separate set of profile
Prefs for this feature rather than syncing with the Desktop Prefs.
This can be updated in time as needed. We have also hidden the
entire feature behind a feature flag, so this CL is not visible
to an average user.

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This CL adds the following:

- Settings sub page for image descriptions
- Preference options for image descriptions
- Associated strings etc for above

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AX-Relnotes: Adds feature to enable generating alt image descriptions
Bug: 1057169
Change-Id: Ie968e8e831b20df7bfbfe27f0ffad1282fd835c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2268299
Commit-Queue: Mark Schillaci <mschillaci@google.com>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Mark Schillaci <mschillaci@google.com>
Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818672}