GitLab

This CL adds a dialog that allows users to enable cloud services in Cast
(Hangouts/Meet, Cast for EDU), and notifies that those services are
governed by the Google Privacy Policy.

The dialog is shown when the user tries to enable cloud services via the
context menu of the Cast toolbar icon ("Enable cloud services") if
the user has not previously acknowledged this dialog or the first run
flow of the old WebUI dialog.

If the user clicks on the "Enable" button in the dialog, we enable the
preferences kMediaRouterEnableCloudServices and
kMediaRouterCloudServicesPrefSet. If the dialog is closed in another
way, we make no pref changes.

Screenshot:
https://drive.google.com/open?id=1MSonPoMLYt0lfLeq9NfP5yoH15EeVZ6c

Bug: 848891

Change-Id: I9f565e328ea0fbc84131eef5e0fa3cb179284886
Reviewed-on: https://chromium-review.googlesource.com/1096403
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570179}