Fix a deadlock in the GPU Video decoding code in the renderer which would occur when the renderer thread was waiting to get the next frame for renderering which attempts to grab the VideoRendererBase lock and the gpu video decoder thread would wait on the renderer thread to execute a task while holding the above lock.
Fix a deadlock in the GPU Video decoding code in the renderer which would occur when the renderer
thread was waiting to get the next frame for renderering which attempts to grab the VideoRendererBase lock
and the gpu video decoder thread would wait on the renderer thread to execute a task while holding the above
lock.

Fix is to post task the demuxer_stream_->Read call to ensure that the lock is released by the gpu video decoder
thread.

BUG=129010
R=fischman
Review URL: https://chromiumcodereview.appspot.com/10408043

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@138120 0039d316-1c4b-4281-b951-d872f2087c98

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