Here are all of the 2010, 2011, and 2012 sacrifice bunt attempts with at least a runner on third base. In other words, here are all of the squeeze plays that the Rangers have attempted from 2010-present. Click on a year to see the data. It's good to show your work.
Not including yesterday, I count 15 squeeze attempts over that period. Julio Borbon has been responsible for four of them, Elvis Andrus for five of them, Craig Gentry for five of them, and Alberto Gonzalez for one of them.
I also count 11 of those squeeze attempts coming with one out. The other four came with no outs.
And over that 2010-12 window, 13 of those 15 squeeze plays brought the runner home from third. One failed because Gentry hit a foul pop out on the bunt attempt and the runner (Yorvit Torrealba) was caught off third base in a man-on-third, one-out situation. The other failed because Gentry apparently didn't bunt the ball to the right spot and the runner at third was forced out at home in a bases-loaded, no-out situation. The other 13 brought the runner home from third base, and five of those 13 squeeze attempts also resulted in the bunter reaching base safely on a single.
So, in other words, Ron Washington presumably considers 13 of those 15 squeeze attempts to have been successful. And Andrus hadn't failed at one yet, and is also the most accomplished and experienced bunter (heh) on the team right now.
I'm not saying I agree with yesterday's squeeze call (I don't, really), but the more information you can bring in when trying to externally evaluate a decision like that, the better.