Centered app list appears on the display of the triggering button.
Centered app list appears on the display of the triggering button.

Previously, the centered app list (with --enable-centered-app-list)
always appeared on the primary display. Now, if launched by clicking the
app list button, it is on that button's display. If launched via the
keyboard, it is on the active display.

The centered app list now behaves the same as the normal app list in
this regard.

BUG=368974
TEST=On multi-monitor setup, with --enable-centered-app-list, clicking
the app launcher button should open the app launcher on the same display
where you clicked the button. (Note: Ctrl+Shift+D to simulate two
monitors on the ChromeOS simulator.)
TEST=On multi-monitor setup, with --enable-centered-app-list, pressing
the search key should always open the app launcher on the display that
currently has focus.

Review URL: https://codereview.chromium.org/260883003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@268820 0039d316-1c4b-4281-b951-d872f2087c98

Just-D/chromium-1,ltilve/chromium,Just-D/chromium-1,Just-D/chromium-1,Pluto-tv/chromium-crosswalk,Chilledheart/chromium,TheTypoMaster/chromium-crosswalk,Chilledheart/chromium,bright-sparks/chromium-spacewalk,hgl888/chromium-crosswalk,dushu1203/chromium.src,Pluto-tv/chromium-crosswalk,jaruba/chromium.src,jaruba/chromium.src,Jonekee/chromium.src,mohamed--abdel-maksoud/chromium.src,Chilledheart/chromium,Pluto-tv/chromium-crosswalk,fujunwei/chromium-crosswalk,hgl888/chromium-crosswalk,Fireblend/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,mohamed--abdel-maksoud/chromium.src,hgl888/chromium-crosswalk,fujunwei/chromium-crosswalk,bright-sparks/chromium-spacewalk,hgl888/chromium-crosswalk-efl,chuan9/chromium-crosswalk,Chilledheart/chromium,Fireblend/chromium-crosswalk,Pluto-tv/chromium-crosswalk,ltilve/chromium,Just-D/chromium-1,Jonekee/chromium.src,hgl888/chromium-crosswalk-efl,hgl888/chromium-crosswalk-efl,bright-sparks/chromium-spacewalk,M4sse/chromium.src,hgl888/chromium-crosswalk-efl,dushu1203/chromium.src,TheTypoMaster/chromium-crosswalk,markYoungH/chromium.src,PeterWangIntel/chromium-crosswalk,fujunwei/chromium-crosswalk,M4sse/chromium.src,hgl888/chromium-crosswalk,bright-sparks/chromium-spacewalk,PeterWangIntel/chromium-crosswalk,krieger-od/nwjs_chromium.src,crosswalk-project/chromium-crosswalk-efl,mohamed--abdel-maksoud/chromium.src,mohamed--abdel-maksoud/chromium.src,Fireblend/chromium-crosswalk,M4sse/chromium.src,chuan9/chromium-crosswalk,jaruba/chromium.src,jaruba/chromium.src,Fireblend/chromium-crosswalk,dushu1203/chromium.src,crosswalk-project/chromium-crosswalk-efl,markYoungH/chromium.src,Chilledheart/chromium,littlstar/chromium.src,markYoungH/chromium.src,Fireblend/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,chuan9/chromium-crosswalk,ondra-novak/chromium.src,Jonekee/chromium.src,Pluto-tv/chromium-crosswalk,axinging/chromium-crosswalk,M4sse/chromium.src,hgl888/chromium-crosswalk-efl,littlstar/chromium.src,dednal/chromium.src,Jonekee/chromium.src,fujunwei/chromium-crosswalk,Just-D/chromium-1,M4sse/chromium.src,axinging/chromium-crosswalk,axinging/chromium-crosswalk,krieger-od/nwjs_chromium.src,Just-D/chromium-1,PeterWangIntel/chromium-crosswalk,markYoungH/chromium.src,krieger-od/nwjs_chromium.src,TheTypoMaster/chromium-crosswalk,hgl888/chromium-crosswalk,markYoungH/chromium.src,Jonekee/chromium.src,chuan9/chromium-crosswalk,axinging/chromium-crosswalk,Jonekee/chromium.src,fujunwei/chromium-crosswalk,bright-sparks/chromium-spacewalk,ondra-novak/chromium.src,mohamed--abdel-maksoud/chromium.src,dednal/chromium.src,chuan9/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,Jonekee/chromium.src,Chilledheart/chromium,krieger-od/nwjs_chromium.src,Chilledheart/chromium,jaruba/chromium.src,hgl888/chromium-crosswalk-efl,mohamed--abdel-maksoud/chromium.src,jaruba/chromium.src,Jonekee/chromium.src,axinging/chromium-crosswalk,dednal/chromium.src,bright-sparks/chromium-spacewalk,hgl888/chromium-crosswalk,axinging/chromium-crosswalk,Fireblend/chromium-crosswalk,krieger-od/nwjs_chromium.src,dednal/chromium.src,fujunwei/chromium-crosswalk,dushu1203/chromium.src,hgl888/chromium-crosswalk,axinging/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,ondra-novak/chromium.src,crosswalk-project/chromium-crosswalk-efl,jaruba/chromium.src,Just-D/chromium-1,krieger-od/nwjs_chromium.src,markYoungH/chromium.src,ltilve/chromium,Chilledheart/chromium,fujunwei/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,dednal/chromium.src,hgl888/chromium-crosswalk-efl,Jonekee/chromium.src,jaruba/chromium.src,dednal/chromium.src,M4sse/chromium.src,chuan9/chromium-crosswalk,ltilve/chromium,axinging/chromium-crosswalk,M4sse/chromium.src,littlstar/chromium.src,ondra-novak/chromium.src,markYoungH/chromium.src,ondra-novak/chromium.src,ondra-novak/chromium.src,Pluto-tv/chromium-crosswalk,dushu1203/chromium.src,hgl888/chromium-crosswalk-efl,crosswalk-project/chromium-crosswalk-efl,dednal/chromium.src,ltilve/chromium,axinging/chromium-crosswalk,krieger-od/nwjs_chromium.src,ondra-novak/chromium.src,crosswalk-project/chromium-crosswalk-efl,ltilve/chromium,chuan9/chromium-crosswalk,Fireblend/chromium-crosswalk,ondra-novak/chromium.src,jaruba/chromium.src,crosswalk-project/chromium-crosswalk-efl,dednal/chromium.src,M4sse/chromium.src,M4sse/chromium.src,axinging/chromium-crosswalk,hgl888/chromium-crosswalk,littlstar/chromium.src,PeterWangIntel/chromium-crosswalk,krieger-od/nwjs_chromium.src,Chilledheart/chromium,dushu1203/chromium.src,PeterWangIntel/chromium-crosswalk,bright-sparks/chromium-spacewalk,fujunwei/chromium-crosswalk,Fireblend/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,PeterWangIntel/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,krieger-od/nwjs_chromium.src,TheTypoMaster/chromium-crosswalk,ondra-novak/chromium.src,dednal/chromium.src,Jonekee/chromium.src,markYoungH/chromium.src,TheTypoMaster/chromium-crosswalk,Pluto-tv/chromium-crosswalk,chuan9/chromium-crosswalk,bright-sparks/chromium-spacewalk,krieger-od/nwjs_chromium.src,Jonekee/chromium.src,markYoungH/chromium.src,Just-D/chromium-1,ltilve/chromium,mohamed--abdel-maksoud/chromium.src,krieger-od/nwjs_chromium.src,hgl888/chromium-crosswalk-efl,dednal/chromium.src,TheTypoMaster/chromium-crosswalk,dednal/chromium.src,fujunwei/chromium-crosswalk,Fireblend/chromium-crosswalk,markYoungH/chromium.src,ltilve/chromium,dushu1203/chromium.src,hgl888/chromium-crosswalk-efl,bright-sparks/chromium-spacewalk,chuan9/chromium-crosswalk,hgl888/chromium-crosswalk,markYoungH/chromium.src,littlstar/chromium.src,dushu1203/chromium.src,littlstar/chromium.src,Pluto-tv/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,axinging/chromium-crosswalk,Pluto-tv/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,M4sse/chromium.src,crosswalk-project/chromium-crosswalk-efl,littlstar/chromium.src,M4sse/chromium.src,dushu1203/chromium.src,ltilve/chromium,PeterWangIntel/chromium-crosswalk,jaruba/chromium.src,Just-D/chromium-1,dushu1203/chromium.src,crosswalk-project/chromium-crosswalk-efl,jaruba/chromium.src,dushu1203/chromium.src,littlstar/chromium.src