Added a GYP_DEFINE to add libraries to the link line.
Added a GYP_DEFINE to add libraries to the link line.

When Chrome is built with -fprofile-generate in *_extra_cflags, it needs to link
against gcov. Adding -lgcov to the link line doesn't help because it occurs
before -Wl,--start-group. This flag correctly adds the required library if used
like the test case described below.

BUG=102550
TEST=GYP_DEFINES="debug_extra_cflags=-fprofile-generate libraries_for_target=-lgcov" ./build/gyp_chromium
make -j5 chrome # passes.


Review URL: http://codereview.chromium.org/10054022

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@132061 0039d316-1c4b-4281-b951-d872f2087c98

zcbenz/cefode-chromium,mohamed--abdel-maksoud/chromium.src,zcbenz/cefode-chromium,mohamed--abdel-maksoud/chromium.src,crosswalk-project/chromium-crosswalk-efl,crosswalk-project/chromium-crosswalk-efl,littlstar/chromium.src,Chilledheart/chromium,M4sse/chromium.src,markYoungH/chromium.src,chuan9/chromium-crosswalk,dednal/chromium.src,axinging/chromium-crosswalk,ltilve/chromium,PeterWangIntel/chromium-crosswalk,zcbenz/cefode-chromium,PeterWangIntel/chromium-crosswalk,dushu1203/chromium.src,markYoungH/chromium.src,pozdnyakov/chromium-crosswalk,Fireblend/chromium-crosswalk,pozdnyakov/chromium-crosswalk,ltilve/chromium,PeterWangIntel/chromium-crosswalk,timopulkkinen/BubbleFish,hujiajie/pa-chromium,patrickm/chromium.src,hgl888/chromium-crosswalk-efl,anirudhSK/chromium,krieger-od/nwjs_chromium.src,jaruba/chromium.src,hgl888/chromium-crosswalk,dushu1203/chromium.src,Fireblend/chromium-crosswalk,patrickm/chromium.src,timopulkkinen/BubbleFish,Just-D/chromium-1,nacl-webkit/chrome_deps,timopulkkinen/BubbleFish,axinging/chromium-crosswalk,patrickm/chromium.src,PeterWangIntel/chromium-crosswalk,dushu1203/chromium.src,anirudhSK/chromium,pozdnyakov/chromium-crosswalk,krieger-od/nwjs_chromium.src,patrickm/chromium.src,junmin-zhu/chromium-rivertrail,krieger-od/nwjs_chromium.src,Fireblend/chromium-crosswalk,markYoungH/chromium.src,patrickm/chromium.src,keishi/chromium,junmin-zhu/chromium-rivertrail,axinging/chromium-crosswalk,markYoungH/chromium.src,ondra-novak/chromium.src,mohamed--abdel-maksoud/chromium.src,Just-D/chromium-1,TheTypoMaster/chromium-crosswalk,pozdnyakov/chromium-crosswalk,ChromiumWebApps/chromium,Just-D/chromium-1,Chilledheart/chromium,Fireblend/chromium-crosswalk,anirudhSK/chromium,ltilve/chromium,dednal/chromium.src,PeterWangIntel/chromium-crosswalk,ltilve/chromium,chuan9/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,Jonekee/chromium.src,hujiajie/pa-chromium,markYoungH/chromium.src,ondra-novak/chromium.src,Chilledheart/chromium,dushu1203/chromium.src,crosswalk-project/chromium-crosswalk-efl,timopulkkinen/BubbleFish,chuan9/chromium-crosswalk,fujunwei/chromium-crosswalk,krieger-od/nwjs_chromium.src,Chilledheart/chromium,axinging/chromium-crosswalk,patrickm/chromium.src,fujunwei/chromium-crosswalk,fujunwei/chromium-crosswalk,robclark/chromium,jaruba/chromium.src,Just-D/chromium-1,dushu1203/chromium.src,junmin-zhu/chromium-rivertrail,ondra-novak/chromium.src,Jonekee/chromium.src,Just-D/chromium-1,keishi/chromium,littlstar/chromium.src,dushu1203/chromium.src,TheTypoMaster/chromium-crosswalk,junmin-zhu/chromium-rivertrail,axinging/chromium-crosswalk,M4sse/chromium.src,ChromiumWebApps/chromium,nacl-webkit/chrome_deps,Pluto-tv/chromium-crosswalk,Pluto-tv/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,mogoweb/chromium-crosswalk,ChromiumWebApps/chromium,zcbenz/cefode-chromium,hujiajie/pa-chromium,junmin-zhu/chromium-rivertrail,markYoungH/chromium.src,krieger-od/nwjs_chromium.src,PeterWangIntel/chromium-crosswalk,krieger-od/nwjs_chromium.src,Jonekee/chromium.src,bright-sparks/chromium-spacewalk,timopulkkinen/BubbleFish,anirudhSK/chromium,dushu1203/chromium.src,axinging/chromium-crosswalk,robclark/chromium,littlstar/chromium.src,bright-sparks/chromium-spacewalk,ondra-novak/chromium.src,hgl888/chromium-crosswalk,Chilledheart/chromium,Chilledheart/chromium,chuan9/chromium-crosswalk,chuan9/chromium-crosswalk,anirudhSK/chromium,hgl888/chromium-crosswalk-efl,dednal/chromium.src,robclark/chromium,mohamed--abdel-maksoud/chromium.src,hujiajie/pa-chromium,junmin-zhu/chromium-rivertrail,dushu1203/chromium.src,krieger-od/nwjs_chromium.src,chuan9/chromium-crosswalk,Fireblend/chromium-crosswalk,anirudhSK/chromium,zcbenz/cefode-chromium,Pluto-tv/chromium-crosswalk,pozdnyakov/chromium-crosswalk,krieger-od/nwjs_chromium.src,littlstar/chromium.src,robclark/chromium,chuan9/chromium-crosswalk,markYoungH/chromium.src,fujunwei/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,pozdnyakov/chromium-crosswalk,M4sse/chromium.src,mogoweb/chromium-crosswalk,chuan9/chromium-crosswalk,jaruba/chromium.src,dednal/chromium.src,Pluto-tv/chromium-crosswalk,markYoungH/chromium.src,nacl-webkit/chrome_deps,robclark/chromium,fujunwei/chromium-crosswalk,mogoweb/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,mogoweb/chromium-crosswalk,nacl-webkit/chrome_deps,mohamed--abdel-maksoud/chromium.src,hujiajie/pa-chromium,hgl888/chromium-crosswalk,bright-sparks/chromium-spacewalk,Chilledheart/chromium,hgl888/chromium-crosswalk-efl,hgl888/chromium-crosswalk-efl,dushu1203/chromium.src,littlstar/chromium.src,ondra-novak/chromium.src,junmin-zhu/chromium-rivertrail,junmin-zhu/chromium-rivertrail,nacl-webkit/chrome_deps,keishi/chromium,bright-sparks/chromium-spacewalk,M4sse/chromium.src,jaruba/chromium.src,nacl-webkit/chrome_deps,hgl888/chromium-crosswalk-efl,zcbenz/cefode-chromium,markYoungH/chromium.src,ltilve/chromium,jaruba/chromium.src,dednal/chromium.src,TheTypoMaster/chromium-crosswalk,ChromiumWebApps/chromium,Jonekee/chromium.src,hujiajie/pa-chromium,axinging/chromium-crosswalk,keishi/chromium,dednal/chromium.src,keishi/chromium,jaruba/chromium.src,mogoweb/chromium-crosswalk,dushu1203/chromium.src,ChromiumWebApps/chromium,crosswalk-project/chromium-crosswalk-efl,krieger-od/nwjs_chromium.src,M4sse/chromium.src,zcbenz/cefode-chromium,anirudhSK/chromium,hgl888/chromium-crosswalk-efl,robclark/chromium,Chilledheart/chromium,hgl888/chromium-crosswalk,robclark/chromium,timopulkkinen/BubbleFish,nacl-webkit/chrome_deps,keishi/chromium,PeterWangIntel/chromium-crosswalk,hgl888/chromium-crosswalk-efl,axinging/chromium-crosswalk,Just-D/chromium-1,Chilledheart/chromium,patrickm/chromium.src,mohamed--abdel-maksoud/chromium.src,Fireblend/chromium-crosswalk,mogoweb/chromium-crosswalk,M4sse/chromium.src,mohamed--abdel-maksoud/chromium.src,junmin-zhu/chromium-rivertrail,dushu1203/chromium.src,jaruba/chromium.src,nacl-webkit/chrome_deps,hujiajie/pa-chromium,markYoungH/chromium.src,hgl888/chromium-crosswalk-efl,Jonekee/chromium.src,hgl888/chromium-crosswalk,pozdnyakov/chromium-crosswalk,junmin-zhu/chromium-rivertrail,littlstar/chromium.src,krieger-od/nwjs_chromium.src,Just-D/chromium-1,bright-sparks/chromium-spacewalk,jaruba/chromium.src,crosswalk-project/chromium-crosswalk-efl,zcbenz/cefode-chromium,Pluto-tv/chromium-crosswalk,mogoweb/chromium-crosswalk,ChromiumWebApps/chromium,ltilve/chromium,hujiajie/pa-chromium,hgl888/chromium-crosswalk,Fireblend/chromium-crosswalk,hgl888/chromium-crosswalk,ondra-novak/chromium.src,M4sse/chromium.src,Fireblend/chromium-crosswalk,jaruba/chromium.src,timopulkkinen/BubbleFish,Pluto-tv/chromium-crosswalk,robclark/chromium,mohamed--abdel-maksoud/chromium.src,mohamed--abdel-maksoud/chromium.src,hgl888/chromium-crosswalk,dednal/chromium.src,Pluto-tv/chromium-crosswalk,zcbenz/cefode-chromium,crosswalk-project/chromium-crosswalk-efl,nacl-webkit/chrome_deps,Jonekee/chromium.src,ChromiumWebApps/chromium,hgl888/chromium-crosswalk-efl,jaruba/chromium.src,bright-sparks/chromium-spacewalk,Jonekee/chromium.src,anirudhSK/chromium,anirudhSK/chromium,anirudhSK/chromium,Fireblend/chromium-crosswalk,chuan9/chromium-crosswalk,ChromiumWebApps/chromium,TheTypoMaster/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,mogoweb/chromium-crosswalk,Just-D/chromium-1,junmin-zhu/chromium-rivertrail,hujiajie/pa-chromium,ChromiumWebApps/chromium,bright-sparks/chromium-spacewalk,ChromiumWebApps/chromium,robclark/chromium,Jonekee/chromium.src,dednal/chromium.src,fujunwei/chromium-crosswalk,fujunwei/chromium-crosswalk,timopulkkinen/BubbleFish,keishi/chromium,hujiajie/pa-chromium,Jonekee/chromium.src,ChromiumWebApps/chromium,mogoweb/chromium-crosswalk,M4sse/chromium.src,timopulkkinen/BubbleFish,ChromiumWebApps/chromium,PeterWangIntel/chromium-crosswalk,ltilve/chromium,mohamed--abdel-maksoud/chromium.src,M4sse/chromium.src,nacl-webkit/chrome_deps,bright-sparks/chromium-spacewalk,axinging/chromium-crosswalk,timopulkkinen/BubbleFish,mogoweb/chromium-crosswalk,hujiajie/pa-chromium,axinging/chromium-crosswalk,hgl888/chromium-crosswalk-efl,M4sse/chromium.src,Jonekee/chromium.src,M4sse/chromium.src,ondra-novak/chromium.src,keishi/chromium,patrickm/chromium.src,littlstar/chromium.src,nacl-webkit/chrome_deps,dednal/chromium.src,robclark/chromium,crosswalk-project/chromium-crosswalk-efl,Just-D/chromium-1,krieger-od/nwjs_chromium.src,dednal/chromium.src,fujunwei/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,bright-sparks/chromium-spacewalk,pozdnyakov/chromium-crosswalk,zcbenz/cefode-chromium,hgl888/chromium-crosswalk,keishi/chromium,axinging/chromium-crosswalk,ondra-novak/chromium.src,Jonekee/chromium.src,pozdnyakov/chromium-crosswalk,zcbenz/cefode-chromium,markYoungH/chromium.src,ondra-novak/chromium.src,timopulkkinen/BubbleFish,fujunwei/chromium-crosswalk,Pluto-tv/chromium-crosswalk,pozdnyakov/chromium-crosswalk,patrickm/chromium.src,jaruba/chromium.src,crosswalk-project/chromium-crosswalk-efl,ltilve/chromium,ltilve/chromium,keishi/chromium,anirudhSK/chromium,dednal/chromium.src,keishi/chromium,Pluto-tv/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,littlstar/chromium.src,anirudhSK/chromium,pozdnyakov/chromium-crosswalk