Chrome OS Version: 10323.24.0, 65.0.3325.59 dev channel

REPRO STEPS:
(1) Create a zip file around 500MB.
(2) Copy the zip file to My Drive.
(3) Go chrome://drive-internals. Click "Clear local data" button.
(4) Open the zip file Files app.
(5) While it is "syncing...", open any other app (e.g. Text editor)
(6) Wait until the zip file mount is finished.

EXPECTED:
This is currently not finalized, but maybe we will expect either of:
 - The original Files app. window navigates to the zip file volume, and the window is focused automatically.
 - A new Files app. window if there is no appropriate one.
 - When it's slow and user is considered doing another task, it should not pop up new window but just show notification like "zip mount has done, you can browse the volume" with link.

There are also other cases:
- Should it open in the original window even when user had moved to another directory in the meantime, and still doing operation there? (this is probably no, as it'll interrupt user's task)
- Should it open in a new window if user closed the Files app. window in the meantime?
- Should it open in a new window if user opened another zip file?

ACTUAL:
It opens a new window if the user is focusing a different app.
It forces navigate to the volume if the user is using the Files app., regardless if the window is the original one or another one newly opened.