Allow gpu features for about:blank (unlike other about: schemes)
Allow gpu features for about:blank (unlike other about: schemes)

TEST=run with --force-compositing-mode and --show-fps-counter, verify
that the counter shows up on about:blank and not on other about: pages
BUG=95107


Review URL: http://codereview.chromium.org/7779022

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@99688 0039d316-1c4b-4281-b951-d872f2087c98

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