Add option to skip rects to drawImageLattice()

bench/DrawLatticeBench.cpp

 /*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #include "Benchmark.h"
 #include "SkCanvas.h"
 #include "SkRect.h"
 #include "SkString.h"
 
 class DrawLatticeBench : public Benchmark {
 public:
     DrawLatticeBench(int* xDivs, int xCount, int* yDivs, int yCount, const SkISize& srcSize,
                      const SkRect& dst, const char* desc)
         : fSrcSize(srcSize)
         , fDst(dst)
     {
         fLattice.fXDivs = xDivs;
         fLattice.fXCount = xCount;
         fLattice.fYDivs = yDivs;
         fLattice.fYCount = yCount;
+        fLattice.fFlags = nullptr;
+        fLattice.fFlagCount = 0;
 
         fName = SkStringPrintf("DrawLattice_%s", desc);
     }
 
     const char* onGetName() override {
         return fName.c_str();
     }
 
     SkIPoint onGetSize() override {
         return SkIPoint::Make(1000, 1000);
@@ skipping 31 matching lines @@
                                       SkRect::MakeWH(500.0f, 500.0f), "Src100_Dst500_Rects9");)
 DEF_BENCH(return new DrawLatticeBench(gDivs9, 2, gDivs9, 2, SkISize::Make(100, 100),
                                       SkRect::MakeWH(1000.0f, 1000.0f), "Src100_Dst1000_Rects9");)
 static int gDivs15[4] = { 15, 45, 55, 85, };
 DEF_BENCH(return new DrawLatticeBench(gDivs15, 4, gDivs15, 4, SkISize::Make(100, 100),
                                       SkRect::MakeWH(250.0f, 250.0f), "Src100_Dst250_Rects15");)
 DEF_BENCH(return new DrawLatticeBench(gDivs15, 4, gDivs15, 4, SkISize::Make(100, 100),
                                       SkRect::MakeWH(500.0f, 500.0f), "Src100_Dst500_Rects15");)
 DEF_BENCH(return new DrawLatticeBench(gDivs15, 4, gDivs15, 4, SkISize::Make(100, 100),
                                       SkRect::MakeWH(1000.0f, 1000.0f), "Src100_Dst1000_Rects15");)