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Previously, thumbnails of offline-available non-image files were not shown. This was because we tried to show self-generated thumbnails when the file cache was present. But we can't generate thumbnails of non-image so the thumbnails of video files were not shown.

With this patch, if thumbnail can't be generated, the thumbnail from the external provider shows instead.

BUG=415048
TEST=manual tested

Review URL: https://codereview.chromium.org/574293002

Cr-Commit-Position: refs/heads/master@{#295893}