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These dialogs are shown when starting to cast or controlling the cast
session. Since they are DialogFragments, a client-side RemoteFragment
is needed to represent them. The implementation is modeled after
SiteSettingsFragmentImpl, although one key difference is that there
is no new Activity. PassthroughFragmentActivity is not refactored for
reuse because it should go away soon, as per crbug.com/1123216

After this change, casting still doesn't work, but the initial
route chooser dialog at least appears.

Bug: 1057100
Change-Id: I9930c6124ff5162a296dcc74637a8489dbb0d96d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432319
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Robbie McElrath <rmcelrath@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812524}