Blink roll 159946:159947

http://build.chromium.org/f/chromium/perf/dashboard/ui/changelog_blink.html?url=/trunk&range=159947:159947&mode=html
TBR=
BUG=

Review URL: https://codereview.chromium.org/27973003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229396 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229396