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Metadata requests in the chrome.fileSystemProvider API declare what
metadata fields they are requesting (i.e. size, modifiction time, etc).
Fields that are provided but not requested will be logged as warnings.

BUG=721790

Change-Id: Ia2c1c1b39f72048be654069557cfc951c5cfc325
Reviewed-on: https://chromium-review.googlesource.com/c/1313989Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Anand Mistry <amistry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604852}