Mv DRRect drawing code from GrDrawContext into SkGpuDevice

This is a TODO left over from https://codereview.chromium.org/1731413002/ (Hide GrDrawTarget from GrOvalRenderer). It is desireable since the GrDrawContext doesn't, in general, manipulate GrFragmentProcessors.

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Review URL: https://codereview.chromium.org/1733993003
4 files changed