Like Apple, Google has profited immensely from the availability and use of Open Source code. LAMP in modified form is the crux of Google SuperComputing which is the companys distinct competitive advantage ->the ability to use massive, grid computing at extremely low cost to support operations like its search engine, Google Mail, Google Maps, and other tools which beat it competitors hands down in speed and simplicity/ease of operation. So you would expect Google to giveback commensurately to the Open Source community.
Again, Google just provided to MySQL large chunks of code that would improve its replications functionas , backup and performance tuning but for very specific engines and circumstances. So if you consider Apple, which uses less Open Source code, to be remiss in contributing back to the community, the inevitable conclusion is that Google is even further behind. Perhaps because Apple and Google are not in the business of attacking Open Source like Redmond is currently doing, they consider themselves excused from proportionately supporting the software communities they so actively depend on.