In the subfolder "CEF" you should find these: (and its dependent DLLs: chrome_elf.dll, d3dcompiler_43.dll, d3dcompiler_47.dll, libEGL.dll, libGLESv2.dll, libcef.dll, swiftshader/libEGL.dll, swiftshader/libGLESv2.dll) and "pbcef" folder
Here is the timeline diagram about how multithread is supported in swiftshader.
It split the draw task into several batches, each batch is executed in one thread.vertex processor and setup processor is executed together, pixel processor is executed after that.