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This CL does the following:
1- Adds 'cr-view-manager' to the profile picker.
2- Starts the implementation of the main profile picker screen.
3- Adds the 'Add Space' icon, which will be the entry point for the
profile creation flow.

Bug: 1063856
Change-Id: I626b3ecbc22129e0ad1478c2258812286efe5588
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2249781
Commit-Queue: Monica Basta <msalama@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779968}