* Redirecting doxygen output to a last_run_output.txt file.
* Maintaining backwards compatibility.
Context-
This CL is a preparatory CL for the housekeeping slave. The slave will use this script to update Doxygen docs. The script will not be used to commit and instead the slave will call AddMergeIntoSvn to commit.
Review URL: https://codereview.appspot.com/6348076
git-svn-id: http://skia.googlecode.com/svn/trunk@4495 2bbb7eff-a529-9590-31e7-b0007b416f81