Initialize RenderWidget's compositing_surface_ to NULL.  This avoids passing garbage down to the GL layers in the test case attached to the bug below. Note that this does not fix the bug, but will avoid potential memory corruption and suppress spurious window system errors.
Initialize RenderWidget's compositing_surface_ to NULL.  This avoids passing garbage down to the GL layers in the test case attached to the bug below.
Note that this does not fix the bug, but will avoid potential memory corruption and suppress spurious window system errors.

BUG=80703
TEST=run the "canvas-popup.html" test case in the bug.  check the chrome_debug.log to see that no EGL or X errors are present.
Review URL: http://codereview.chromium.org/7108042

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@88547 0039d316-1c4b-4281-b951-d872f2087c98

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