Google has been pretty influential in PL, especially in the PL/systems domain (MapReduce); just because they aren't designing so many mainstream languages doesn't mean people like Jeff Dean aren't putting their PL skillz to work. In fact, many of the heavy hitters at Google have PL backgrounds and do a lot of PL work, they are just pragmatic and realize that not all PL work involves overtly new languages.
And then there is what Holzle, Bak, Bracha, etc...are doing with Dart; and of course Pike with Go.
And then there is what Holzle, Bak, Bracha, etc...are doing with Dart; and of course Pike with Go.