https://bugs.webkit.org/show_bug.cgi?id=75825

Patch by Balazs Ankes <bank@inf.u-szeged.hu> on 2012-07-11
Reviewed by Dirk Pranke.

Refactor the png.py to avoid code duplication.

* Scripts/webkitpy/common/checksvnconfigfile.py: Added.
(check):
(config_file_path):
(errorstr_autoprop):
(errorstr_png):
* Scripts/webkitpy/style/checkers/png.py:
(PNGChecker.check):
* Scripts/webkitpy/tool/commands/download.py:
(Land):
* Scripts/webkitpy/tool/steps/__init__.py:
* Scripts/webkitpy/tool/steps/addsvnmimetypeforpng.py: Added.
(AddSvnMimetypeForPng):
(AddSvnMimetypeForPng.__init__):
(AddSvnMimetypeForPng.run):
(AddSvnMimetypeForPng._check_pngs):
* Scripts/webkitpy/tool/steps/addsvnmimetypeforpng_unittest.py: Added.
(MockSCMDetector):
(MockSCMDetector.__init__):
(MockSCMDetector.display_name):
(AddSvnMimetypeForPngTest):
(AddSvnMimetypeForPngTest.test_run):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@122311 268f45cc-cd09-0410-ab3c-d52691b4dbfc