Start to propagate constness of GrPipelineBuilder up the stack

src/gpu/GrAADistanceFieldPathRenderer.cpp

Index: src/gpu/GrAADistanceFieldPathRenderer.cpp
diff --git a/src/gpu/GrAADistanceFieldPathRenderer.cpp b/src/gpu/GrAADistanceFieldPathRenderer.cpp
index c11c641f57116739f241a4d21b385077393f0453..ca0f4e3d651a9eda7939c756eed95a55b0eb2390 100755
--- a/src/gpu/GrAADistanceFieldPathRenderer.cpp
+++ b/src/gpu/GrAADistanceFieldPathRenderer.cpp
@@ -583,7 +583,7 @@ bool GrAADistanceFieldPathRenderer::onDrawPath(GrDrawTarget* target,
 
     SkAutoTUnref<GrBatch> batch(AADistanceFieldPathBatch::Create(geometry, color, viewMatrix,
                                                                  fAtlas, &fPathCache, &fPathList));
-    target->drawBatch(pipelineBuilder, batch);
+    target->drawBatch(*pipelineBuilder, batch);
 
     return true;
 }