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DirectoryItem created without a specific NavigationModelItem defaults
to SubDirectoryItem. Change DirectoryItem to check if entry has a
NavigationModelItem to generate the appropriate derived "item" type
from DirectoryItem. In particular, crostini will generate FakeItem.
This fixes issue where crostini wouldn't mount because the trigger
to mount is on FakeItem.

Change FakeItem to have updateSharedStatusIcon as no-op, since it
doesn't have a shared state. This fixes an error where DirectoryItem
calls updateSharedStatusIcon on its sub-items, before FakeItem was
used only as top-level so nobody was calling updateSharedStatusIcon.

Change DirectoryTree to call EntryList to update its sub-directories
since those sub-directories are usually volumes that need to update
themselves.

Add test createFolderNestedDownloads to check that EntryListItem call
to updateSubDirectories doesn't have to be recursive.

Change SubDirectoryItem to add "volume-type-for-testing" in test to
fix tests using this selector when running with My Files enabled if
the item is a volume.

Bug: 857335
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I8a579b9c754143d9ba8322aba9014e82a3ac1757
Reviewed-on: https://chromium-review.googlesource.com/1133616
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574811}