Attach GrOptDrawState into shader building pipeline

include/gpu/GrEffectStage.h

Index: include/gpu/GrEffectStage.h
diff --git a/include/gpu/GrEffectStage.h b/include/gpu/GrEffectStage.h
index 44997901a4e050dbb250afbe1a597b3777cfb52e..0b2b807a8ab93328299a1d3fb4336c70344e81ca 100644
--- a/include/gpu/GrEffectStage.h
+++ b/include/gpu/GrEffectStage.h
@@ -138,6 +138,14 @@ public:
 
     void convertToPendingExec() { fEffect.convertToPendingExec(); }
 
+    void remapAttribIndices(const int* map) {
+        for (int i = 0; i < 2; ++i) {
+            if (-1 != fVertexAttribIndices[i]) {
+                fVertexAttribIndices[i] = map[fVertexAttribIndices[i]];
+            }
+        }
+    }
+
 private:
     bool                                fCoordChangeMatrixSet;
     SkMatrix                            fCoordChangeMatrix;