Makes dragging download item HiDPI.
Makes dragging download item HiDPI.

Bug=None
Test=Manual, see below.

Run Chrome with --force-device-scale-factor=2
Go to google.com and download web page.
When download is completed, drag download item. Make sure that the text shown while dragging is not blurry.

Review URL: https://chromiumcodereview.appspot.com/10785036

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@147294 0039d316-1c4b-4281-b951-d872f2087c98

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