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This code path is used by chrome://downloads, devtools, and elsewhere
to show a file in the operating system's native file explorer. Wire the
call in lacros to the equivalent call in ash via crosapi.

This is a new interface, instead of part of "SelectFile", because
SelectFile deals exclusively with opening/saving files. It's an
implementation detail on Chrome OS that the open/save dialog and the
general purpose file explorer share the same implementation.

Bug: 1139128
Test: Download a file, "Show in folder" in chrome://downloads works
Change-Id: I6234ea03e673ca4c9ca2566721e281d52041e101
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2488396
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Darin Fisher <darin@chromium.org>
Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819958}