Roll third_party/freetype to @a2b9955b49034a51dfbc8bf9f4e9d312149cecac.

This adds support of color glyphs.
The freetype version is between 2.4.12 and 2.5.0.
Updated libpng accordingly which is required by the new freetype.

BUG=290583
R=phajdan.jr@chromium.org
TBR=darin

Review URL: https://codereview.chromium.org/89813002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242776 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242777 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242777