Add matrix constructing helpers to SkMatrix

bench/HairlinePathBench.cpp

 /*
  * Copyright 2013 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 "SkPaint.h"
@@ skipping 41 matching lines @@
 
     void onDraw(const int loops, SkCanvas* canvas) override {
         SkPaint paint(fPaint);
         this->setupPaint(&paint);
 
         paint.setAntiAlias(fFlags & kAA_Flag ? true : false);
 
         SkPath path;
         this->makePath(&path);
         if (fFlags & kBig_Flag) {
-            SkMatrix m;
-            m.setScale(SkIntToScalar(3), SkIntToScalar(3));
+            const SkMatrix m = SkMatrix::MakeScale(SkIntToScalar(3), SkIntToScalar(3));
             path.transform(m);
         }
 
         for (int i = 0; i < loops; i++) {
             canvas->drawPath(path, paint);
         }
     }
 
 private:
     SkPaint     fPaint;
@@ skipping 155 matching lines @@
 // Don't have default path renderer for conics yet on GPU, so must use AA
 // DEF_BENCH( return new ConicPathBench(FLAGS00); )
 // DEF_BENCH( return new ConicPathBench(FLAGS01); )
 DEF_BENCH( return new ConicPathBench(FLAGS10); )
 DEF_BENCH( return new ConicPathBench(FLAGS11); )
 
 DEF_BENCH( return new CubicPathBench(FLAGS00); )
 DEF_BENCH( return new CubicPathBench(FLAGS01); )
 DEF_BENCH( return new CubicPathBench(FLAGS10); )
 DEF_BENCH( return new CubicPathBench(FLAGS11); )