virtual/gpu/fast/canvas/canvas-composite-image.html timeout
virtual/gpu/fast/canvas/canvas-composite-image.html timeout

It timeouts on not only Mac and Win, but also on Linux.
Flakiness dashboard:
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=virtual%2Fgpu%2Ffast%2Fcanvas%2Fcanvas-composite-image.html

NOTRY=true
BUG=433711
TBR=yosin@chromium.org

Review URL: https://codereview.chromium.org/733043002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@185415 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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