PyAuto: fix extra flags passed to chrome
PyAuto: fix extra flags passed to chrome

1. Fix so that extra flags passed actually get passed on to chrome
2. Make it easier (get rid of --ui-test-flags option since it was cumbersome)
  Now, extra options can be passed like:
  python mytest.py --chrome-flags="--enable-crash-reporter"

Still need a way for an individual TestCase to be able to add flags, without
being provided from the command line.

Review URL: http://codereview.chromium.org/2833015

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@50170 0039d316-1c4b-4281-b951-d872f2087c98

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