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Currently, it only adds pylint checks, with a blacklist for all the
files that fail horribly (or in otherwise mysterious ways).

Also fix a few (less mysterious) pylint failures. Remove some pylint
suppressions (since we now add appropriate directories to the python
module path for pylint).

R=sky@chromium.org

Review URL: https://codereview.chromium.org/443293003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287988 0039d316-1c4b-4281-b951-d872f2087c98