Implement clone for 6 additional GrFragmentProcessor subclasses.

GrMagnifierEffect
GrMorphologyEffect
GrBicubicEffect
GrGaussianConvolutionFragmentProcessor
GrMatrixConvolutionEffect
GrTextureDomainEffect

Bug: skia:
Change-Id: I69721b9b95346b365723e5ee21dff2dee8884466
Reviewed-on: https://skia-review.googlesource.com/27900
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
10 files changed