[jefftk]

I think this makes Chrome build system number four: scons, gyp, ninja, siso.

[enqk]

gyp to gn

gyp could produce ninja files. gn is short for generate ninja. Now gn produces files compatible with siso

[csiegert]

Please add punctuation. I had to read it twice to understand.

[jefftk]

Producing ninja files was an intermediate phase in the transition to gn. For most of its lifetime it was producing makefile.