Linux sandbox: more internal timeout in unit tests.
Linux sandbox: more internal timeout in unit tests.

Every SANDBOX_TEST derivative will now use poll() with a timeout
instead of a blocking write.

This is a second layer to make sure that our tests have a timeout.

BUG=169416
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/12018029

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@177875 0039d316-1c4b-4281-b951-d872f2087c98

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