Chrome v48 - Beacons Do Not Load When Window is Minimized

[advir1]

Description: When running on Chrome v48.0.2564.97, beacons no longer load when window is minimized before the ad starts playing.

Steps to reproduce:

1. Install Chrome update to v48.0.2564.97
2. Start running a page with a player in a x-domain iframe that loads an ad
3. Wait for the player to load
4. Before the ad loads into the player, minimize the window
5. Wait for the ad to play while the player is minimized

Expected result: Beacons should load and viewability should be measurable

Actual result: Beacons do not load until window is maximized again, causing viewability not to be measurable as long as the window is minimized