When a button may have grown (e.g. icon loaded), recompute if we need to show/hide the "off the side" button on the right of the bookmark bar.
When a button may have grown (e.g. icon loaded), recompute if we need
to show/hide the "off the side" button on the right of the bookmark
bar.

BUG=http://crbug.com/21887
TEST=Get a bunch of bookmarks with icons.  Shrink the window width
until the icon JUST BARELY appears.  Quit and relaunch Chrome.  Make
sure "iff the side" button is visible.


Review URL: http://codereview.chromium.org/249037

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@27618 0039d316-1c4b-4281-b951-d872f2087c98

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