As usual, China aint gonna do sh!t. China tends to focus its attention inwardly. It either does not want to get involved with, or simply does not give a damn about things going on else where in the world.
But either way, one thing that China will NOT do is go against the US. There are 2 reasons for this and they are both related to their economics. One:
they want MFN status from the US, and Two: they desperately want to be part of the WTO. They'll achieve neither of the above by displeasing the US.