GitLab

Corrects the location for the Discover feed header menu IPH bubble by
using the view instead of the button's frame. Adds an event for when
the Discover feed is loaded in order to add a server-side config for
the IPH.

Bug: 1124448, 1085419
Change-Id: I4df2919e428a5cdc429b6b157a34b82f80e3421b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401971Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Adam Trudeau-Arcaro <adamta@google.com>
Cr-Commit-Position: refs/heads/master@{#805914}