UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36

Steps to reproduce the problem:
1. Install the Hangouts App and have a way to re-launch it within the same browser session (ie. Pinning to taskbar)
2. Enable Transparent UI
3. Change the Zoom level under 100%
4. Close hangouts (while keeping Chrome running), and re-open it

What is the expected behavior?
Hangouts would still re-open successfully, as it still does at 100%+ Zoom.

What went wrong?
Depending on your zoom setting, Hangouts will re-launch show a very cut-UI (ie. 90% Zoom), or show itself as a completely black interface that can't be interacted with (ie. 75% Zoom).  Additionally, using any Zoom level other than 100% will cause a black background, as opposed to the expected Alpha Compositing.

Did this work before? N/A 

Chrome version: 51.0.2704.106  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Shockwave Flash 22.0 r0