Reland "IPCThreadState: Add a public method to probe if a binder call is being served.""

This reverts commit d2e4de2a.

Reason for revert: Dependencies which broke tests due to exclusion from 
                   LOCAL_JNI_SHARED_LIBS have been added.

Change-Id: If400a48214274d121e79135ac5d573fcb1a4a4c2