Start to propagate constness of GrPipelineBuilder up the stack

src/gpu/GrAAHairLinePathRenderer.cpp

Index: src/gpu/GrAAHairLinePathRenderer.cpp
diff --git a/src/gpu/GrAAHairLinePathRenderer.cpp b/src/gpu/GrAAHairLinePathRenderer.cpp
index 14770b85317e48b71f2c7c56c162cf656f5aa8b9..8a0c9a4f57fac4625ebb1f09340e8c40d7b662d3 100644
--- a/src/gpu/GrAAHairLinePathRenderer.cpp
+++ b/src/gpu/GrAAHairLinePathRenderer.cpp
@@ -983,7 +983,7 @@ bool GrAAHairLinePathRenderer::onDrawPath(GrDrawTarget* target,
 
     SkAutoTUnref<GrBatch> batch(create_hairline_batch(color, viewMatrix, path, stroke,
                                                       devClipBounds));
-    target->drawBatch(pipelineBuilder, batch);
+    target->drawBatch(*pipelineBuilder, batch);
 
     return true;
 }