Add IOS sheriffs to waterfall display.
Add IOS sheriffs to waterfall display.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=157574

Review URL: https://codereview.chromium.org/10937035

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@157581 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build