Add python scripting for detailed statistics output from rasterize_and_record_micro.

BUG=344689
R=ernstm@chromium.org, vmpstr@chromium.org

Review URL: https://codereview.chromium.org/175683004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253293 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253293