This change includes: * adding -j option for track(caption) testing,  * clean up setting CHROME_FLAGS related code * remove the loop for media cache testing and control it directly from commandline using -c option (enable/disable media cache)
This change includes:
* adding -j option for track(caption) testing, 
* clean up setting CHROME_FLAGS related code
* remove the loop for media cache testing and control it directly from commandline using -c option (enable/disable media cache)


Review URL: http://codereview.chromium.org/7074060

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@88358 0039d316-1c4b-4281-b951-d872f2087c98

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