Google has been very adamant that the NSA does not have access to their servers.
No, Google did not choose to join a program that would give NSA access.
"we have not joined any program that would give the U.S. government—or any other government—direct access to our servers. "
Source: http://googleblog.blogspot.be/2013/06/what.html
We know nothing about what Google did not choose to do, for all intents and purposes, because the NSA does have this goal i assume they have (or are going to) meet it. Likely in secret.
Furthermore as stated elsewhere encryption is irrelevant, with or without willing cooperation from Google Inc. the NSA is able to decrypt it.