Log the source when a URLFetcher leak is detected
Log the source when a URLFetcher leak is detected

Now that we have a mechanism to detect URLFetcher leaks in test suites, we're seeing instances of leaks that are causing redness on the chromium waterfall. However, the logs do not reveal which URLFetcher caused the leak, and makes fixing the problem hard, particularly when the leak is a rarity.

This patch adds logging info that specifies the source of the leak.

TBR=willchan@chromium.org
BUG=146826
TEST=Run a test that leaks a URL, and make sure the logs indicate the source.

Review URL: https://chromiumcodereview.appspot.com/10914134

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@155278 0039d316-1c4b-4281-b951-d872f2087c98

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