Activate RootWindow when opening background ContextMenu  This causes the active root window != the root window of active window. I'm still vague about what this really means, but this was causing a menu widget being created on other display (which leads to crash) and I'd like to check this in to proceed.
Activate RootWindow when opening background ContextMenu
 This causes the active root window != the root window of
active window. I'm still vague about what this really means,
but this was causing a menu widget being created on other display (which leads to crash) and I'd like to check
this in to proceed.

 I'll add test once http://codereview.chromium.org/10536187/ is landed.

BUG=123160
TEST=none

Review URL: https://chromiumcodereview.appspot.com/10553013

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@142729 0039d316-1c4b-4281-b951-d872f2087c98

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