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

src/gpu/effects/GrConvexPolyEffect.cpp

Index: src/gpu/effects/GrConvexPolyEffect.cpp
diff --git a/src/gpu/effects/GrConvexPolyEffect.cpp b/src/gpu/effects/GrConvexPolyEffect.cpp
index 14307165e3b3415a5747c7de96818d42db64a0a0..248cd1735352a27dc4ac7b5a33ef33a81e1b3f6d 100644
--- a/src/gpu/effects/GrConvexPolyEffect.cpp
+++ b/src/gpu/effects/GrConvexPolyEffect.cpp
@@ -44,9 +44,9 @@
     virtual void onComputeInvariantOutput(GrInvariantOutput* inout) const SK_OVERRIDE {
         if (fRect.isEmpty()) {
             // An empty rect will have no coverage anywhere.
-            inout->mulByKnownSingleComponent(0);
+            inout->mulByKnownAlpha(0);
         } else {
-            inout->mulByUnknownSingleComponent();
+            inout->mulByUnknownAlpha();
         }
     }
 
@@ -323,7 +323,7 @@
 GrConvexPolyEffect::~GrConvexPolyEffect() {}
 
 void GrConvexPolyEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const {
-    inout->mulByUnknownSingleComponent();
+    inout->mulByUnknownAlpha();
 }
 
 void GrConvexPolyEffect::getGLProcessorKey(const GrGLCaps& caps,