Implement blur types for GPU-based Gaussian blur.

Implements the remaining blur types (inner, outer, solid) in the
GPU-based Gaussian blur.  They are implemented using a post-upsampling blending
pass.  Also includes some code cleanup and comments.

Review URL:  http://codereview.appspot.com/4664075/



git-svn-id: http://skia.googlecode.com/svn/trunk@1839 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed