Google uses a font in its documents that you can see in the names of many of its products:
Check out this PDF file to see the font in different weights: http://goo.gl/Sk90
What font is that?
Typophile
Google corporate font
Actually, I just found another PDF that says it's Trade Gothic! It sure looks like it:
Well they're both grotesques but I don't think they look all that similar. Check the bowl of the lowercase a, and the width. Top terminal of t is sheared differently. Trade Gothic has a spurred G...
EDIT More info here
Captured from web.archive.org on 25 Jan 2015. view this capture