Add gyp support for Core Data datamodel (*.xcdatamodel) files
Add gyp support for Core Data datamodel (*.xcdatamodel) files

Contributed by kanefsky@gmail.com
Cloned from:
http://codereview.chromium.org/11275067/

BUG=303
TEST=Verify xcdatamodel files are editable in xcode project.
TBR=mark@chromium.org
Review URL: https://codereview.chromium.org/11367037

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@1529 78cadc50-ecff-11dd-a971-7dbc132099af

IllusionRom-deprecated/android_platform_external_chromium_org_tools_gyp,clar/gyp,bnoordhuis/gyp,okwasi/gyp,amoikevin/gyp,sdklite/gyp,svn2github/gyp,AWhetter/gyp,IllusionRom-deprecated/android_platform_external_chromium_org_tools_gyp,bulldy80/gyp_unofficial,bpsinc-native/src_tools_gyp,okumura/gyp,duanhjlt/gyp,saghul/gyn,ttyangf/gyp,yjhjstz/gyp,duanhjlt/gyp,azunite/gyp_20150930,yinquan529/platform-external-chromium_org-tools-gyp,lukeweber/gyp-override,okumura/gyp,svn2github/gyp,dougbeal/gyp,okumura/gyp,msc-/gyp,sport-monkey/GYP,yangrongwei/gyp,dougbeal/gyp,bdarnell/gyp,bnq4ever/gypgoogle,openpeer/webrtc-gyp,mumble-voip/libmumble-gyp,svn2github/kgyp,bnoordhuis/gyp,brson/gyp,ryfx/gyp,turbulenz/gyp,luvit/gyp,mgamer/gyp,turbulenz/gyp,kevinchen3315/gyp-git,tarc/gyp,ttyangf/pdfium_gyp,springmeyer/gyp,sdklite/gyp,channing/gyp,amoikevin/gyp,sloanyang/gyp,Phuehvk/gyp,sport-monkey/GYP,kevinchen3315/gyp-git,Jack-Q/GYP-copy,mumble-voip/libmumble-gyp,mumble-voip/libmumble-gyp,pyokagan/gyp,omasanori/gyp,cchamberlain/gyp,AWhetter/gyp,AWhetter/gyp,alexcrichton/gyp,Jack-Q/GYP-copy,cysp/gyp,tarc/gyp,mgamer/gyp,cchamberlain/gyp,ttyangf/gyp,ryfx/gyp,xin3liang/platform_external_chromium_org_tools_gyp,enkripsi/gyp,azunite/gyp_20150930,cchamberlain/gyp,sloanyang/gyp,luvit/gyp,openpeer/webrtc-gyp,yangrongwei/gyp,openpeer/webrtc-gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,AWhetter/gyp,svn2github/kgyp,carlTLR/gyp,mkrautz/gyp-libmumble,azunite/gyp,duanhjlt/gyp,cysp/gyp,ttyangf/pdfium_gyp,okwasi/gyp,azunite/gyp,mgamer/gyp,yjhjstz/gyp,bulldy80/gyp_unofficial,lukeweber/gyp-override,lukeweber/gyp-override,android-ia/platform_external_chromium_org_tools_gyp,ttyangf/gyp,MIPS/external-chromium_org-tools-gyp,enkripsi/gyp,clar/gyp,ttyangf/pdfium_gyp,sanyaade-teachings/gyp,carlTLR/gyp,omasanori/gyp,mistydemeo/gyp,yinquan529/platform-external-chromium_org-tools-gyp,channing/gyp,azunite/gyp,bpsinc-native/src_tools_gyp,azunite/gyp,LazyCodingCat/gyp,kevinchen3315/gyp-git,springmeyer/gyp,svn2github/kgyp,saghul/gyn,cchamberlain/gyp,alexcrichton/gyp,adblockplus/gyp,LazyCodingCat/gyp,luvit/gyp,android-ia/platform_external_chromium_org_tools_gyp,Jack-Q/GYP-copy,Chilledheart/gyp,azunite/gyp,svn2github/kgyp,IllusionRom-deprecated/android_platform_external_chromium_org_tools_gyp,mgamer/gyp,bulldy80/gyp_unofficial,mkrautz/gyp-libmumble,Phuehvk/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,xin3liang/platform_external_chromium_org_tools_gyp,LazyCodingCat/gyp,pyokagan/gyp,channing/gyp,sanyaade-teachings/gyp,Danath/gyp,duanhjlt/gyp,enkripsi/gyp,mistydemeo/gyp,azunite/gyp_20150930,mkrautz/gyp-libmumble,Danath/gyp,xin3liang/platform_external_chromium_org_tools_gyp,trafi/gyp,ttyangf/gyp,luvit/gyp,mkrautz/gyp-libmumble,Jack-Q/GYP-copy,mapbox/gyp,enkripsi/gyp,mapbox/gyp,AWhetter/gyp,mapbox/gyp,Chilledheart/gyp,yinquan529/platform-external-chromium_org-tools-gyp,mumble-voip/libmumble-gyp,bdarnell/gyp,bdarnell/gyp,tarc/gyp,adblockplus/gyp,dougbeal/gyp,dougbeal/gyp,mistydemeo/gyp,sdklite/gyp,svn2github/gyp,Omegaphora/external_chromium_org_tools_gyp,MIPS/external-chromium_org-tools-gyp,Omegaphora/external_chromium_org_tools_gyp,Chilledheart/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,trafi/gyp,omasanori/gyp,clar/gyp,saghul/gyn,Omegaphora/external_chromium_org_tools_gyp,pandaxcl/gyp,Danath/gyp,bnoordhuis/gyp,sanyaade-teachings/gyp,saghul/gyn,pyokagan/gyp,AOSPU/external_chromium_org_tools_gyp,sport-monkey/GYP,mapbox/gyp,cysp/gyp,pandaxcl/gyp,yinquan529/platform-external-chromium_org-tools-gyp,brson/gyp,openpeer/webrtc-gyp,chromium/gyp,cchamberlain/gyp,azunite/gyp_20150930,MIPS/external-chromium_org-tools-gyp,yangrongwei/gyp,AOSPU/external_chromium_org_tools_gyp,springmeyer/gyp,turbulenz/gyp,bulldy80/gyp_unofficial,AOSPU/external_chromium_org_tools_gyp,carlTLR/gyp,pandaxcl/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,adblockplus/gyp,openpeer/webrtc-gyp,MIPS/external-chromium_org-tools-gyp,cysp/gyp,alexcrichton/gyp,LazyCodingCat/gyp,bnoordhuis/gyp,turbulenz/gyp,sanyaade-teachings/gyp,mapbox/gyp,pandaxcl/gyp,ttyangf/gyp,amoikevin/gyp,Danath/gyp,ryfx/gyp,trafi/gyp,tarc/gyp,springmeyer/gyp,saghul/gyn,svn2github/gyp,msc-/gyp,ryfx/gyp,alexcrichton/gyp,enkripsi/gyp,bnoordhuis/gyp,Danath/gyp,carlTLR/gyp,xin3liang/platform_external_chromium_org_tools_gyp,brson/gyp,springmeyer/gyp,svn2github/kgyp,channing/gyp,chromium/gyp,omasanori/gyp,amoikevin/gyp,android-ia/platform_external_chromium_org_tools_gyp,dougbeal/gyp,okwasi/gyp,bpsinc-native/src_tools_gyp,okwasi/gyp,sdklite/gyp,clar/gyp,adblockplus/gyp,erikge/watch_gyp,LazyCodingCat/gyp,trafi/gyp,yjhjstz/gyp,mistydemeo/gyp,sport-monkey/GYP,duanhjlt/gyp,Jack-Q/GYP-copy,cysp/gyp,bnq4ever/gypgoogle,android-ia/platform_external_chromium_org_tools_gyp,ryfx/gyp,bpsinc-native/src_tools_gyp,yjhjstz/gyp,chromium/gyp,yjhjstz/gyp,adblockplus/gyp,Chilledheart/gyp,bdarnell/gyp,Phuehvk/gyp,msc-/gyp,bulldy80/gyp_unofficial,svn2github/gyp,clar/gyp,Chilledheart/gyp,Omegaphora/external_chromium_org_tools_gyp,IllusionRom-deprecated/android_platform_external_chromium_org_tools_gyp,sdklite/gyp,pyokagan/gyp,sloanyang/gyp,erikge/watch_gyp,brson/gyp,tarc/gyp,Phuehvk/gyp,AOSPU/external_chromium_org_tools_gyp,sanyaade-teachings/gyp,bnq4ever/gypgoogle,turbulenz/gyp,chromium/gyp,yangrongwei/gyp,okumura/gyp,msc-/gyp,pyokagan/gyp,azunite/gyp_20150930,carlTLR/gyp,ttyangf/pdfium_gyp,msc-/gyp,erikge/watch_gyp,chromium/gyp,amoikevin/gyp,kevinchen3315/gyp-git,sloanyang/gyp,erikge/watch_gyp,ttyangf/pdfium_gyp,sport-monkey/GYP,bnq4ever/gypgoogle,erikge/watch_gyp,pandaxcl/gyp,mgamer/gyp,trafi/gyp,bnq4ever/gypgoogle,Phuehvk/gyp,lukeweber/gyp-override