Start to propagate constness of GrPipelineBuilder up the stack

gm/texturedomaineffect.cpp

Index: gm/texturedomaineffect.cpp
diff --git a/gm/texturedomaineffect.cpp b/gm/texturedomaineffect.cpp
index 471360428d382d3225200aff71117b5689fc4a12..ed74dd7227f6320454af37fd53b329a6302e6afc 100644
--- a/gm/texturedomaineffect.cpp
+++ b/gm/texturedomaineffect.cpp
@@ -130,7 +130,7 @@ protected:
                     pipelineBuilder.setRenderTarget(rt);
                     pipelineBuilder.addColorProcessor(fp);
 
-                    tt.target()->drawSimpleRect(&pipelineBuilder,
+                    tt.target()->drawSimpleRect(pipelineBuilder,
                                                 GrColor_WHITE,
                                                 viewMatrix,
                                                 renderRect);