Replace the primary scrollbar with a fake one to prepare for a persistent chat…
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Description

Replace the primary scrollbar with a fake one to prepare for a persistent chat column

Summary:
Ref T7014. With a mouse plugged in, multi-panel UIs are pretty hideous on OSX. This is somewhat offputting for me in Conpherence, and really jumps out at me with the new column mocks in T7014.

Sites like Twitch and Facebook approach this by emulating the touchpad scrollbar to achieve a more aesthetic UI. Use a similar approach.

This:

Replaces the main scrollbar with a prettier fake one.
This prepares the standard page frame for a persistent chat column.

Test Plan:

Seems to work properly on OSX, Chrome and Firefox. Haven't tested on IE; my Windows setup is pretty iffy at the moment.
Tried Conpherence.
Tried Workboards.

Reviewers: btrahan, chad

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T7014

Differential Revision: https://secure.phabricator.com/D11472