Revert 142880 - Revert 142054 (apparently caused http://crbug.com/132813) - Make discarding Frontbuffer on mac actually drop resources without a discarded backbuffer.
Revert 142880 - Revert 142054 (apparently caused http://crbug.com/132813)
- Make discarding Frontbuffer on mac actually drop resources without a discarded backbuffer.


BUG=132444,132813
TEST=Manual


Review URL: https://chromiumcodereview.appspot.com/10535147

TBR=mmocny@chromium.org
Review URL: https://chromiumcodereview.appspot.com/10580010

TBR=thakis@chromium.org
Review URL: https://chromiumcodereview.appspot.com/10653005

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@143465 0039d316-1c4b-4281-b951-d872f2087c98

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