Start to propagate constness of GrPipelineBuilder up the stack

src/gpu/GrDashLinePathRenderer.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDashLinePathRenderer.h"
 
 #include "GrGpu.h"
@@ skipping 14 matching lines @@
 
 bool GrDashLinePathRenderer::onDrawPath(GrDrawTarget* target,
                                         GrPipelineBuilder* pipelineBuilder,
                                         GrColor color,
                                         const SkMatrix& viewMatrix,
                                         const SkPath& path,
                                         const GrStrokeInfo& stroke,
                                         bool useAA) {
     SkPoint pts[2];
     SkAssertResult(path.isLine(pts));
-    return GrDashingEffect::DrawDashLine(target, pipelineBuilder, color,
+    return GrDashingEffect::DrawDashLine(target, *pipelineBuilder, color,
                                          viewMatrix, pts, useAA, stroke);
 }