GitLab

Currently all conversions to or from PNG will request (and so possibly
create and cache) an ImageSkia intermediate representation.

Depends on http://codereview.chromium.org/10799014/

I'm reverting because this has Uninitialized issue and a test is failing on mac valgrind bots

TBR=cjhopman@chromium.org
BUG=123865
TEST=none
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/10826181

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150294 0039d316-1c4b-4281-b951-d872f2087c98