Start to propagate constness of GrPipelineBuilder up the stack

gm/beziereffects.cpp

Index: gm/beziereffects.cpp
diff --git a/gm/beziereffects.cpp b/gm/beziereffects.cpp
index 384889f0c50c74e7c895fca3425c66279601675c..5e00608fa7d7ad41740b43800173a42f7535c0ca 100644
--- a/gm/beziereffects.cpp
+++ b/gm/beziereffects.cpp
@@ -229,7 +229,7 @@ protected:
                     SkAutoTUnref<GrBatch> batch(
                             BezierCubicOrConicTestBatch::Create(gp, geometry, klmEqs, klmSigns[c]));
 
-                    tt.target()->drawBatch(&pipelineBuilder, batch);
+                    tt.target()->drawBatch(pipelineBuilder, batch);
                 }
                 ++col;
                 if (numCols == col) {
@@ -374,7 +374,7 @@ protected:
                     SkAutoTUnref<GrBatch> batch(
                             BezierCubicOrConicTestBatch::Create(gp, geometry, klmEqs, 1.f));
 
-                    tt.target()->drawBatch(&pipelineBuilder, batch);
+                    tt.target()->drawBatch(pipelineBuilder, batch);
                 }
                 ++col;
                 if (numCols == col) {
@@ -612,7 +612,7 @@ protected:
 
                     SkAutoTUnref<GrBatch> batch(BezierQuadTestBatch::Create(gp, geometry, DevToUV));
 
-                    tt.target()->drawBatch(&pipelineBuilder, batch);
+                    tt.target()->drawBatch(pipelineBuilder, batch);
                 }
                 ++col;
                 if (numCols == col) {