Fix feature_canvas2d test to make a canvas larger than the min size (256x256) so that  when the fix for https://bugs.webkit.org/show_bug.cgi?id=80451 rolls it won't break the test. BUG=117030 Review URL: https://chromiumcodereview.appspot.com/9615030
Fix feature_canvas2d test to make a canvas larger than the min size (256x256) so that 
when the fix for https://bugs.webkit.org/show_bug.cgi?id=80451 rolls it won't break the test.
BUG=117030
Review URL: https://chromiumcodereview.appspot.com/9615030

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@125265 0039d316-1c4b-4281-b951-d872f2087c98

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