Modify SequencedWorkerPoolTaskRunner's RunsTasksOnCurrentThread method to more specifically test if the underlying SWP is currently running a task that matches the runner's sequence token.
Modify SequencedWorkerPoolTaskRunner's RunsTasksOnCurrentThread method to more specifically test if the underlying SWP is currently running a task that matches the runner's sequence token.

TEST=existing tests in sequenced_worker_pool_task_runner_unittest.cc apply
Review URL: https://chromiumcodereview.appspot.com/9979029

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@130810 0039d316-1c4b-4281-b951-d872f2087c98

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