Add suppression for Skia roll

One layout test needs rebaselining with the next Skia roll:
https://storage.googleapis.com/chromium-layout-test-archives/linux_blink_rel/79661/layout-test-results/results.html

BUG=559240
NOTRY=true
TBR=jvanverth@google.com

Review URL: https://codereview.chromium.org/1468053003 .

Cr-Commit-Position: refs/heads/master@{#361217}

third_party/WebKit/LayoutTests/TestExpectations

@@ -483,6 +483,8 @@ crbug.com/412381 imported/web-platform-tests/mediacapture-streams/obtaining-loca
 crbug.com/412381 imported/web-platform-tests/mediacapture-streams/obtaining-local-multimedia-content/navigatorusermedia/getusermedia-trivial-constraint.html [ Failure ]
 crbug.com/412381 imported/web-platform-tests/mediacapture-streams/obtaining-local-multimedia-content/navigatorusermedia/unknownkey-option-param.html [ Failure ]
 
+crbug.com/559240 virtual/gpu/fast/canvas/canvas-imageSmoothingQuality-pixel.html [ NeedsManualRebaseline ]
+
 crbug.com/325673 imported/web-platform-tests/custom-elements/concepts/custom-elements-type-allowed-chars-first-char.html [ Failure Timeout ]
 crbug.com/325673 imported/web-platform-tests/custom-elements/concepts/custom-elements-type-allowed-chars.html [ Failure Timeout ]
 crbug.com/325673 imported/web-platform-tests/custom-elements/concepts/custom-elements-type-naming.html [ Failure ]