Nw19 gyp build

[jtg-gg]

Roger Wang

I propose of copying the chromium build folder into node and use the common.gypi there

I need to make nwjs build for arm, I usually use cross compile method with linux x64 as the host the current simplified common.gypi does not work, too many dependencies are needed so copying the whole build folder is better

I've tested my pull request on win / mac / linux should be working fine

the only different, when calling build/gyp_chromium use -I src/third_party/node/build/common.gypi

Jefry