Add linux_clang to default try set so when one runs `git try` or `gcl try` it will add linux_clang automatically.
Add linux_clang to default try set so when one runs `git try` or `gcl try` it
will add linux_clang automatically.

TEST=Less tree breakage because of not trying changes on clang first.
BUG=None
NOTRY=true

Review URL: http://codereview.chromium.org/9395027

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@122041 0039d316-1c4b-4281-b951-d872f2087c98

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