Make safely-roll-webkit.py more configurable.
Make safely-roll-webkit.py more configurable.

While webkit gardening today, I ran into trouble with my old git workflow: the origin is origin/trunk, not the origin/master which was hard baked into this script. I've added a new option --upstream to set any origin you'd like for more complex scenarios, and left the default intact.

As long as I was here, I added some help strings and an option to not auto commit-queue the CL.

TEST=manual
R=maruel@chromium.org,pdr@chromium.org
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/10907010

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@154250 0039d316-1c4b-4281-b951-d872f2087c98

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