Implement additional set operators: STLSetUnion, STLSetIntersection and STLIncludes.

BUG=336824
TBR=willchan@chromium.org, jyasskin@chromium.org
(lgtm'ed in https://codereview.chromium.org/145663004/)

Review URL: https://codereview.chromium.org/148183012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247711 0039d316-1c4b-4281-b951-d872f2087c98
roll skia DEPS to 13227

Chromium base revision: 247533 / 3d2a6e2e
Old Skia revision: 13188
New Skia revision: 13227
Control CL: https://codereview.chromium.org/148583012

This CL was created by Skia's roll_deps.py script.

Bypassing commit queue trybots:
NOTRY=true
R=reed@google.com

Review URL: https://codereview.chromium.org/132103007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247712 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247713 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247713