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This patch updates line_location.js to support deciphering paths that fall
under Google Drive > Computers.

Adds an integration test which ensures that Computers entries can be navigated,
which has the side effect of also testing that the breadcrumbs are working as
breadcrumbs are used to work out where the navigation has actually navigated to.

Bug: 884020
Change-Id: I8ea14eb6716a5060005442e65d07125b41a9c4a3
Reviewed-on: https://chromium-review.googlesource.com/c/1312178
Commit-Queue: Stuart Langley <slangley@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604761}