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/

BUG=123865

TEST=

Review URL: https://chromiumcodereview.appspot.com/10799014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150228 0039d316-1c4b-4281-b951-d872f2087c98