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Add My Files parent on navigation tree, navigation_list_model.js
creates the "My Files" entry as a EntryList and EntryListItem on
directory_tree.js is the UI element to display it.

This is a continuation of:
 * crrev.com/c/1086680
 * crrev.com/c/1116400
 * crrev.com/c/1116517

Some changes required to display EntryList:
 * isDescendantEntry: Inspect on each of EntryList's children.
 * FileManager.initializeUI: Fetch asynchronously the flag to be able
to use before displaying the navigation tree.
 * extract the switch (modelItem.type) to its own function, to be able
to reuse it.

Design doc: https://docs.google.com/document/d/1X5XSLKJd0yerL-qFhpb2z9ibUVb_W3gG_tfIV7T_Qt0

Bug: 846587, 846592, 846591, 846590, 846589, 846588, 846586
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: Id8f27f09763d4478b93d52dd32e4ed851c7e448d
Reviewed-on: https://chromium-review.googlesource.com/1113258
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Naoki Fukino <fukino@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Reviewed-by: Sasha Morrissey <sashab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572507}