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If Google adopts an existing OSS technology, it usually takes the form of Google contributors joining a core team for the OSS in question. The OSS community generally isn't a fan of single companies taking _over_ a project and generally prefers ownership changes in the other direction (e.g. Kubernetes getting transferred to the CNCF).

That being said, the most noticeable example here that I can think of is Google migrating its internal C++ toolchain from using gcc/g++ to clang.

They've bought and kept running many projects. YouTube, Writely (now google docs), Android to name a few.

Webkit.