Initial change to create GeometryProcessor

src/gpu/GrDrawState.h

Index: src/gpu/GrDrawState.h
diff --git a/src/gpu/GrDrawState.h b/src/gpu/GrDrawState.h
index 00bec9f7c24f45e9088440bd6cdd1614e1d8764d..357b0a6540d0336830cde4dc5923e2d4dc5ef6a0 100644
--- a/src/gpu/GrDrawState.h
+++ b/src/gpu/GrDrawState.h
@@ -185,6 +185,14 @@ public:
     /// the color / coverage distinction.
     ////
 
+    const GrEffect* setGeometryProcessor(const GrEffect* effect, int attr0 = -1, int attr1 = -1) {
+        SkASSERT(NULL != effect);
+        SkASSERT(!this->hasGeometryProcessor());
+        fGeometryProcessor.reset(new GrEffectStage(effect, attr0, attr1));
+        this->invalidateBlendOptFlags();
+        return effect;
+    }
+
     const GrEffect* addColorEffect(const GrEffect* effect, int attr0 = -1, int attr1 = -1) {
         SkASSERT(NULL != effect);
         SkNEW_APPEND_TO_TARRAY(&fColorStages, GrEffectStage, (effect, attr0, attr1));
@@ -242,6 +250,7 @@ public:
 
     private:
         GrDrawState* fDrawState;
+        SkAutoTDelete<GrEffectStage> fGeometryProcessor;
         int fColorEffectCnt;
         int fCoverageEffectCnt;
     };
@@ -364,6 +373,7 @@ public:
         GrDrawState*                                        fDrawState;
         SkMatrix                                            fViewMatrix;
         int                                                 fNumColorStages;
+        bool                                                fHasGeometryProcessor;
         SkAutoSTArray<8, GrEffectStage::SavedCoordChange>   fSavedCoordChanges;
     };