Clamp radii in FEMorphology::createImageFilter

Sk{Dilate,Erode}ImageFilter::Make take the radii as integers (int), so
make sure to convert the float FEMorphology stores avoiding overflow.

BUG=675164

Review-Url: https://codereview.chromium.org/2585233002
Cr-Commit-Position: refs/heads/master@{#439474}
1 file changed