Add our new AdSense id to the demo page.
Add our new AdSense id to the demo page.

This is one of the steps required to set up
Google Ad Manager, which we need for SS ads testing.

Change-Id: I5ea467335897065a0502622bf0d30c5b3b0612b8

shaka-project/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,tvoli/shaka-player