Send position with mouse up/down events. 
Send position with mouse up/down events. 

This change ensures that client & host agree on the position of mouse button events. This is especially relevant in the case where the client's plugin is not receiving mouse move events because it doesn't have focus, and the user clicks on the plugin. Without positional information, the host will process the button event at the host's initial mouse position, very likely not at the position intended by the user. 

BUG=110688
TEST=manual

Review URL: http://codereview.chromium.org/9264060

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@119934 0039d316-1c4b-4281-b951-d872f2087c98

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