Generate response files out of the source tree with xcode & xcode-ninja.
Generate response files out of the source tree with xcode & xcode-ninja.

Configure generator_filelist_paths used by main gyp input parse to build
path of "<|()" expansions file names when using "xcode" and "xcode-ninja"
generators to be out of the source tree.

The "xcode" generator will put the files in "xcodebuild/gypfiles" while
the "xcode-ninja" generator will use the same algorithm to generate the
file names as "ninja" generator (but using "gypfiles-xcode-ninja" as
last component of the path).

BUG=chromium:562135
R=mark@chromium.org

Review URL: https://codereview.chromium.org/1477333003 .

bnoordhuis/gyp,adblockplus/gyp,ttyangf/gyp,AWhetter/gyp,chromium/gyp,msc-/gyp,bnoordhuis/gyp,chromium/gyp,bnoordhuis/gyp,msc-/gyp,ttyangf/gyp,Phuehvk/gyp,AWhetter/gyp,turbulenz/gyp,chromium/gyp,chromium/gyp,turbulenz/gyp,AWhetter/gyp,turbulenz/gyp,ttyangf/gyp,Phuehvk/gyp,chromium/gyp,Phuehvk/gyp,bnoordhuis/gyp,Phuehvk/gyp,adblockplus/gyp,AWhetter/gyp,ttyangf/gyp,bnoordhuis/gyp,Phuehvk/gyp,AWhetter/gyp,msc-/gyp,adblockplus/gyp,msc-/gyp,msc-/gyp,turbulenz/gyp,adblockplus/gyp,turbulenz/gyp,adblockplus/gyp,ttyangf/gyp