With one click on the button the font size on the current page will be increase.
Accessibility: Zoom Text Only
Here you can make the font of a website bigger with just one click on the button.
And it is great for reading on high DPI screens!
Changelog:
http://docs.google.com/View?id=dfjh722z_76d5rjt8f7
Font Size Decrease can be found here:
https://chrome.google.com/extensions/detail/mpajngnpcmjjeoflljdjpnehcfaldcia