Revert "Trimmed the branch to only the stereo_synchronizer sub directory"

This reverts commit d2abfc964a453b6c36d8be261ad75a4f10ad9ef2.
Rebase from 'upstream'
Trimmed the branch to only the stereo_synchronizer sub directory
Revert "Trimmed the branch to only the stereo_synchronizer sub directory"

This reverts commit 684aff7fbadf907788ef4727675a5604c0cb617a.
Rebase from 'upstream' (no changes)
Trimmed the branch to only the stereo_synchronizer sub directory