Xcode: Add .xcassets = folder.assetcatalog in extension_map
Xcode: Add .xcassets = folder.assetcatalog in extension_map

This allows lastKnownFileType to be set for files named, for instance,
Images.xcassets.

Patch by Matthew DeVore <matvore@google.com>
Review URL: https://codereview.chromium.org/140103003/


git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@1843 78cadc50-ecff-11dd-a971-7dbc132099af

springmeyer/gyp,dougbeal/gyp,LazyCodingCat/gyp,svn2github/kgyp,svn2github/kgyp,sanyaade-teachings/gyp,clar/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,saghul/gyn,cysp/gyp,okumura/gyp,clar/gyp,AWhetter/gyp,ryfx/gyp,enkripsi/gyp,azunite/gyp_20150930,pandaxcl/gyp,bpsinc-native/src_tools_gyp,springmeyer/gyp,amoikevin/gyp,bnoordhuis/gyp,bulldy80/gyp_unofficial,AWhetter/gyp,trafi/gyp,ryfx/gyp,luvit/gyp,Jack-Q/GYP-copy,amoikevin/gyp,dougbeal/gyp,bnq4ever/gypgoogle,Chilledheart/gyp,ttyangf/gyp,bnoordhuis/gyp,Omegaphora/external_chromium_org_tools_gyp,xin3liang/platform_external_chromium_org_tools_gyp,tarc/gyp,amoikevin/gyp,pandaxcl/gyp,bnoordhuis/gyp,sanyaade-teachings/gyp,Phuehvk/gyp,Jack-Q/GYP-copy,AWhetter/gyp,turbulenz/gyp,yjhjstz/gyp,mapbox/gyp,sdklite/gyp,bpsinc-native/src_tools_gyp,bnq4ever/gypgoogle,ttyangf/pdfium_gyp,cchamberlain/gyp,openpeer/webrtc-gyp,mgamer/gyp,enkripsi/gyp,Phuehvk/gyp,Chilledheart/gyp,pyokagan/gyp,AOSPU/external_chromium_org_tools_gyp,adblockplus/gyp,Danath/gyp,duanhjlt/gyp,luvit/gyp,ttyangf/pdfium_gyp,tarc/gyp,yjhjstz/gyp,cchamberlain/gyp,pandaxcl/gyp,LazyCodingCat/gyp,LazyCodingCat/gyp,trafi/gyp,saghul/gyn,ryfx/gyp,carlTLR/gyp,ttyangf/pdfium_gyp,Omegaphora/external_chromium_org_tools_gyp,ttyangf/gyp,msc-/gyp,android-ia/platform_external_chromium_org_tools_gyp,erikge/watch_gyp,AWhetter/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,mapbox/gyp,mgamer/gyp,ttyangf/gyp,Omegaphora/external_chromium_org_tools_gyp,Jack-Q/GYP-copy,ttyangf/pdfium_gyp,springmeyer/gyp,Danath/gyp,bulldy80/gyp_unofficial,omasanori/gyp,cchamberlain/gyp,msc-/gyp,bnoordhuis/gyp,sdklite/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,duanhjlt/gyp,mapbox/gyp,omasanori/gyp,svn2github/gyp,Phuehvk/gyp,adblockplus/gyp,AOSPU/external_chromium_org_tools_gyp,sport-monkey/GYP,bnoordhuis/gyp,saghul/gyn,azunite/gyp,azunite/gyp_20150930,tarc/gyp,AWhetter/gyp,erikge/watch_gyp,bulldy80/gyp_unofficial,msc-/gyp,bnq4ever/gypgoogle,sanyaade-teachings/gyp,trafi/gyp,svn2github/kgyp,amoikevin/gyp,openpeer/webrtc-gyp,ttyangf/pdfium_gyp,tarc/gyp,ttyangf/gyp,pyokagan/gyp,pyokagan/gyp,enkripsi/gyp,Chilledheart/gyp,yjhjstz/gyp,okumura/gyp,omasanori/gyp,turbulenz/gyp,amoikevin/gyp,dougbeal/gyp,chromium/gyp,chromium/gyp,enkripsi/gyp,clar/gyp,okumura/gyp,Danath/gyp,Chilledheart/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,bnq4ever/gypgoogle,bnq4ever/gypgoogle,yjhjstz/gyp,AOSPU/external_chromium_org_tools_gyp,saghul/gyn,adblockplus/gyp,mgamer/gyp,springmeyer/gyp,pyokagan/gyp,cysp/gyp,Omegaphora/external_chromium_org_tools_gyp,ttyangf/gyp,LazyCodingCat/gyp,azunite/gyp_20150930,adblockplus/gyp,turbulenz/gyp,springmeyer/gyp,duanhjlt/gyp,svn2github/gyp,sdklite/gyp,sport-monkey/GYP,msc-/gyp,Jack-Q/GYP-copy,Danath/gyp,turbulenz/gyp,azunite/gyp_20150930,azunite/gyp,duanhjlt/gyp,pyokagan/gyp,tarc/gyp,openpeer/webrtc-gyp,Chilledheart/gyp,android-ia/platform_external_chromium_org_tools_gyp,LazyCodingCat/gyp,ryfx/gyp,azunite/gyp,msc-/gyp,carlTLR/gyp,svn2github/gyp,luvit/gyp,clar/gyp,android-ia/platform_external_chromium_org_tools_gyp,pandaxcl/gyp,ryfx/gyp,clar/gyp,android-ia/platform_external_chromium_org_tools_gyp,openpeer/webrtc-gyp,dougbeal/gyp,cysp/gyp,cysp/gyp,carlTLR/gyp,okumura/gyp,xin3liang/platform_external_chromium_org_tools_gyp,svn2github/kgyp,trafi/gyp,dougbeal/gyp,svn2github/gyp,chromium/gyp,sanyaade-teachings/gyp,omasanori/gyp,mapbox/gyp,bpsinc-native/src_tools_gyp,xin3liang/platform_external_chromium_org_tools_gyp,mapbox/gyp,bulldy80/gyp_unofficial,bpsinc-native/src_tools_gyp,duanhjlt/gyp,sdklite/gyp,sdklite/gyp,azunite/gyp,carlTLR/gyp,erikge/watch_gyp,azunite/gyp_20150930,cchamberlain/gyp,carlTLR/gyp,turbulenz/gyp,erikge/watch_gyp,sport-monkey/GYP,AOSPU/external_chromium_org_tools_gyp,svn2github/kgyp,trafi/gyp,cchamberlain/gyp,Phuehvk/gyp,Phuehvk/gyp,sanyaade-teachings/gyp,luvit/gyp,chromium/gyp,svn2github/gyp,mgamer/gyp,pandaxcl/gyp,yjhjstz/gyp,saghul/gyn,bulldy80/gyp_unofficial,mgamer/gyp,xin3liang/platform_external_chromium_org_tools_gyp,erikge/watch_gyp,azunite/gyp,chromium/gyp,openpeer/webrtc-gyp,sport-monkey/GYP,Danath/gyp,sport-monkey/GYP,enkripsi/gyp,adblockplus/gyp,Jack-Q/GYP-copy,cysp/gyp