Tell BrowserAccessibilityState when Chrome OS accessibility is turned on. This will improve feedback for a couple of toolbar controls that check this state, and also start collecting UMA statistics on accessibility usage in Chrome OS.
Tell BrowserAccessibilityState when Chrome OS accessibility is turned on.
This will improve feedback for a couple of toolbar controls that check
this state, and also start collecting UMA statistics on accessibility usage
in Chrome OS.

BUG=99504
TEST=none

Review URL: http://codereview.chromium.org/8537024

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@109851 0039d316-1c4b-4281-b951-d872f2087c98

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