In retrospect, the timing of Google introducing PFS is interesting. It's possible they introduced it because they either knew about or suspected the surveillance but either had no proof or were unable to talk about it. Of course, maybe they're just security conscious but it's interesting that Adam Langley so explicitly referred to the recording for later decryption scenario.
The USA has one of the least intrusive, least overbroad surveillance regimes in the world. Google introduced PFS because governments in places like India and Russia openly desire to intercept all communications.
