Clip GPU blur against clip bounds. Clip the size of the FBOs used for blurs

to the bounds of the clipping region, inflated by the blur radius.  This is a
little tricky, since we want the rect we use for downsampling to be an integer
multiple of the scale factor, so we scale down the clip rect to downsampled
space, inflate by the (scaled) kernel width, and intersect the rects there.

Also check the blur radius against 0 and abort early, to prevent the fuzzer
blowing up on a missing uniform.

Review URL:  http://codereview.appspot.com/4841043/



git-svn-id: http://skia.googlecode.com/svn/trunk@2020 2bbb7eff-a529-9590-31e7-b0007b416f81

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