Revert of Remove GP from drawstate, revision of invariant output for GP

src/gpu/effects/GrConvolutionEffect.h

Index: src/gpu/effects/GrConvolutionEffect.h
diff --git a/src/gpu/effects/GrConvolutionEffect.h b/src/gpu/effects/GrConvolutionEffect.h
index 1d0950bfa58ea401e459c303e5032b2a25042a71..7fda3699c3c3cb3254026f797283a6f63b1ec3ad 100644
--- a/src/gpu/effects/GrConvolutionEffect.h
+++ b/src/gpu/effects/GrConvolutionEffect.h
@@ -99,7 +99,7 @@
     virtual void onComputeInvariantOutput(GrInvariantOutput* inout) const {
         // If the texture was opaque we could know that the output color if we knew the sum of the
         // kernel values.
-        inout->mulByUnknownFourComponents();
+        inout->mulByUnknownColor();
     }
 
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;