Add a webstorePrivate API to show a permission prompt for delegated bundle installs, try 2
(i.e. remote installs of a bundle for another user).
Also add a new permission prompt type for this case.
This is the "bundle" version of https://crrev.com/
850283003.
This CL was originally committed as https://crrev.com/
1189133002 and reverted as https://crrev.com/
1205863002 due to breaking browser_tests (dbg).
TBR since the original CL has been reviewed, and the additional fix is trivial.
TBR=kalman
BUG=397951
Review URL: https://codereview.chromium.org/
1208563002
Cr-Commit-Position: refs/heads/master@{#335928}