Make onPrepareDraws const

src/gpu/batches/GrDrawAtlasBatch.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 "GrDrawAtlasBatch.h"
 #include "GrBatchFlushState.h"
 #include "GrBatchTest.h"
@@ skipping 33 matching lines @@
     Color gpColor(color);
     if (hasColors) {
         gpColor.fType = Color::kAttribute_Type;
     }
     
     Coverage coverage(coverageIgnored ? Coverage::kNone_Type : Coverage::kSolid_Type);
     LocalCoords localCoords(LocalCoords::kHasExplicit_Type);
     return GrDefaultGeoProcFactory::Create(gpColor, coverage, localCoords, viewMatrix);
 }
 
-void GrDrawAtlasBatch::onPrepareDraws(Target* target) {
+void GrDrawAtlasBatch::onPrepareDraws(Target* target) const {
     // Setup geometry processor
     SkAutoTUnref<const GrGeometryProcessor> gp(set_vertex_attributes(this->hasColors(),
                                                                      this->color(),
                                                                      this->viewMatrix(),
                                                                      this->coverageIgnored()));
     
     target->initDraw(gp, this->pipeline());
     
     int instanceCount = fGeoData.count();
     size_t vertexStride = gp->getVertexStride();
@@ skipping 193 matching lines @@
     
     SkMatrix viewMatrix = GrTest::TestMatrix(random);
     
     GrDrawAtlasBatch::Geometry geometry;
     geometry.fColor = GrRandomColor(random);
     return GrDrawAtlasBatch::Create(geometry, viewMatrix, spriteCount, xforms.begin(),
                                     texRects.begin(), hasColors ? colors.begin() : nullptr);
 }
 
 #endif