Mark fast/canvas/color-space/canvas-drawImage-offscreenCanvas.html flaky

TBR=hbos@chromium.org
NOTRY=true

Bug: 1010472
Change-Id: Idd6a3e1a0c13241801d93cb8956aa406b4713fbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1835698Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701998}

third_party/blink/web_tests/TestExpectations

@@ -6197,3 +6197,6 @@ crbug.com/1010032 [ Win7 ] fast/text/selection/khmer-selection.html [ Failure ]
 crbug.com/1010032 [ Win7 ] fast/writing-mode/Kusa-Makura-background-canvas.html [ Failure ]
 crbug.com/1010170 [ Mac ] media/video-played-reset.html [ Failure ]
 
+# Sheriff 2019-10-02
+crbug.com/1010472 [ Linux Mac Debug ] fast/canvas/color-space/canvas-drawImage-offscreenCanvas.html [ Timeout Pass ]
+