Unofficial gardening. Widen expectations for a flaky test.

TBR=vsevik
BUG=100798

Review URL: https://codereview.chromium.org/18799002

git-svn-id: svn://svn.chromium.org/blink/trunk@153644 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Unofficial gardening. Mark fast/canvas/getPutImageDataPairTest.html as Slow on all platforms.

BUG=237000
TBR=vsevik

Review URL: https://codereview.chromium.org/18719004

git-svn-id: svn://svn.chromium.org/blink/trunk@153645 bbb929c8-8fbe-4397-9dbb-9b2b20218538