Avoid calls to gtk_widget_get_pointer during mouse move if not necessary.  This is to work around janky scrolling behavior that brad was seeing.  I can't repro, so he'll have to tell me if this works for him
Avoid calls to gtk_widget_get_pointer during mouse move if
not necessary.  This is to work around janky scrolling behavior
that brad was seeing.  I can't repro, so he'll have to tell me if
this works for him

BUG=16786

Review URL: http://codereview.chromium.org/160179


git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@21675 0039d316-1c4b-4281-b951-d872f2087c98

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