Remove GP from drawstate, revision of invariant output for GP

src/gpu/GrDefaultGeoProcFactory.cpp

Index: src/gpu/GrDefaultGeoProcFactory.cpp
diff --git a/src/gpu/GrDefaultGeoProcFactory.cpp b/src/gpu/GrDefaultGeoProcFactory.cpp
index dca6c1c017a4d8b14aa8021f4c2d7b0e20aa8e2a..7756f6a1fc15a69b4173a357fd333d31dc9b065f 100644
--- a/src/gpu/GrDefaultGeoProcFactory.cpp
+++ b/src/gpu/GrDefaultGeoProcFactory.cpp
@@ -128,11 +128,12 @@ private:
         return gp.fFlags == this->fFlags;
     }
 
-    virtual void onComputeInvariantOutput(GrInvariantOutput* inout) const SK_OVERRIDE {
+    virtual void onGetOutputCoverage(GrInitInvariantOutput* out) const SK_OVERRIDE {
         if (fInCoverage) {
-            inout->mulByUnknownAlpha();
+            out->setUnknownSingleComponent();
         } else {
-            inout->mulByKnownAlpha(255);
+            // uniform coverage
+            out->setKnownSingleComponent(this->coverage());
         }
     }