* Revert "Pass option to reuse an existing runtime controller (#4253)"
This reverts commit 57f361dc6abcd8441c444882c5e8bb99519532f3.
* Revert "Document the Porter-Duff operators. (#4250)"
This reverts commit b15fa9c64e1028187ec9592289919d77a6843802.
* Revert "Move channel and codec related files to common (#4225)"
This reverts commit 674a3f5869d3ae0e7ea3583a2d0942e184817903.