aura: Fix external texture layers when scaling up
aura: Fix external texture layers when scaling up

After r136220, having a layer bigger than the texture would stretch the texture instead of keeping a smaller web layer
This fixes it.

BUG=None
TEST=run chrome with aura, load complex page, resize, observe no stretching.


Review URL: https://chromiumcodereview.appspot.com/10389221

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@138024 0039d316-1c4b-4281-b951-d872f2087c98

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