GitLab

This CL changes a ctor for HoverButton to take an optional View object
for showing an arbitrary secondary icon, instead of taking a boolean
for whether to show an arrow icon.

The HoverButton will be used by the Cast dialog to list devices.

Bug: 826089
Change-Id: Iac36c2bc8a60666bc6aa035fbcbbedd0f59c66cf
Reviewed-on: https://chromium-review.googlesource.com/989023
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547575}