Try to find trunk/src/tools/python before importing google.path_utils. Don't require the buildbot slave_scripts unless running a test that needs them.
Try to find trunk/src/tools/python before importing google.path_utils.
Don't require the buildbot slave_scripts unless running a test that needs them.

BUG=none
TEST=run 'smoketests.py --tests=ui' without having tools\buildbot\scripts\slave
    checked out
Review URL: http://codereview.chromium.org/174191

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@23922 0039d316-1c4b-4281-b951-d872f2087c98

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