[Mac] Log some NSException info with crash dumps.
[Mac] Log some NSException info with crash dumps.

Adds two breakpad keys.  "firstexception" will store the name and
reason for the first NSException caught by the event loop.
"lastexception" will store the same for the last one seen before
crashing.

http://crbug.com/24462
TEST=Hard to test without known exceptions to handle.

Review URL: http://codereview.chromium.org/275008

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@29349 0039d316-1c4b-4281-b951-d872f2087c98

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