Make onPrepareDraws const

src/gpu/batches/GrAAHairLinePathRenderer.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrAAHairLinePathRenderer.h"
 
 #include "GrBatchFlushState.h"
@@ skipping 694 matching lines @@
         // setup batch properties
         fBatch.fColorIgnored = !opt.readsColor();
         fBatch.fColor = fGeoData[0].fColor;
         fBatch.fUsesLocalCoords = opt.readsLocalCoords();
         fBatch.fCoverageIgnored = !opt.readsCoverage();
         fBatch.fCoverage = fGeoData[0].fCoverage;
     }
 
     SkSTArray<1, Geometry, true>* geoData() { return &fGeoData; }
 
-    void onPrepareDraws(Target*) override;
+    void onPrepareDraws(Target*) const override;
 
     typedef SkTArray<SkPoint, true> PtArray;
     typedef SkTArray<int, true> IntArray;
     typedef SkTArray<float, true> FloatArray;
 
     AAHairlineBatch(const Geometry& geometry) : INHERITED(ClassID()) {
         fGeoData.push_back(geometry);
 
         // compute bounds
         fBounds = geometry.fPath.getBounds();
@@ skipping 57 matching lines @@
         bool fColorIgnored;
         bool fCoverageIgnored;
     };
 
     BatchTracker fBatch;
     SkSTArray<1, Geometry, true> fGeoData;
 
     typedef GrVertexBatch INHERITED;
 };
 
-void AAHairlineBatch::onPrepareDraws(Target* target) {
+void AAHairlineBatch::onPrepareDraws(Target* target) const {
     // Setup the viewmatrix and localmatrix for the GrGeometryProcessor.
     SkMatrix invert;
     if (!this->viewMatrix().invert(&invert)) {
         return;
     }
 
     // we will transform to identity space if the viewmatrix does not have perspective
     bool hasPerspective = this->viewMatrix().hasPerspective();
     const SkMatrix* geometryProcessorViewM = &SkMatrix::I();
     const SkMatrix* geometryProcessorLocalM = &invert;
@@ skipping 188 matching lines @@
     GrColor color = GrRandomColor(random);
     SkMatrix viewMatrix = GrTest::TestMatrix(random);
     GrStrokeInfo stroke(SkStrokeRec::kHairline_InitStyle);
     SkPath path = GrTest::TestPath(random);
     SkIRect devClipBounds;
     devClipBounds.setEmpty();
     return create_hairline_batch(color, viewMatrix, path, stroke, devClipBounds);
 }
 
 #endif