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Adds a 'Manage in Drive' button to the context menu for entries in the
Files app for ChromeOS.

Creates a new DriveManageAction which appears enabled only for
non-directory entries (for now) in Drive when offline mode is not
enabled. Uses getEntryProperties() for the entry to get its
'alternateUrl' (provided by the Drive Sync API) and navigates to this
URL in the browser.

'Manage in Drive', ensure the browser window opens and navigates to the
file.

Test: Right-click on a file in Google Drive in the File Manager, select
Bug: 831480
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ieaa359b9e825bef166ea25ec23ae1693681d91f7
Reviewed-on: https://chromium-review.googlesource.com/1011465
Commit-Queue: Sasha Morrissey <sashab@chromium.org>
Reviewed-by: Naoki Fukino <fukino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556375}