Tags give the ability to mark specific points in history as being important
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upstream/20121204-2009021134468a2c · ·android commit from dec 4th, 2012 imposing as json.org 20090211 
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subtree_split_2012-01-0334468a2c · ·imported from dalvik libcore json/ on jan 03 2012 https://android.googlesource.com/platform/libcore/ git subtree is a shellscript found in gits contrib section. interactiv rebasing was necessary because the automatic splitting left some commits with the full libcore content.