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New media view volumes are added to chromeos::VolumeManager so that they are
available to Files.app. UI patches are coming later, so at this point it looks like
unusable unknown volumes appear in Files.app. To hide them from users for now,
the feature is guarded with base::FeatureList. Once UI is ready I will make them
enabled by default.

BUG=chromium:671511
TEST=New (unusable) volumes are shown with --enable-features=ArcMediaView
TEST=Media views work with local pending UI patches

Review-Url: https://codereview.chromium.org/2580303002
Cr-Commit-Position: refs/heads/master@{#443205}