GitLab

To be used in tast test:
https://chromium-review.googlesource.com/c/chromiumos/platform/tast-tests/+/1351973

* Added chrome.fileManagerPrivate.unsharePathWithCrostini.  This function
  complements the existing fileManagerPrivate.sharePathsWithCrostini.

* Added util.getEntries which returns a Promise with an object of
  all entries of a provided volume keyed by fullPath.  This is a
  handy wrapper over the existing util.readEntriesRecursively.

Bug: 907231
Change-Id: Ieccdc76a6457fed44d85633e9a02c658424b967d
Reviewed-on: https://chromium-review.googlesource.com/c/1354755Reviewed-by: Stuart Langley <slangley@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612555}