Add performance benchmark before landing perf improvements that remove sk_bezero in SkMatrix44

bench/Matrix44Bench.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBenchmark.h"
 #include "SkMatrix44.h"
 #include "SkRandom.h"
@@ skipping 40 matching lines @@
             (void) (fM0 == fM1);
             (void) (fM1 == fM2);
             (void) (fM2 == fM0);
         }
     }
 private:
     SkMatrix44 fM0, fM1, fM2;
     typedef Matrix44Bench INHERITED;
 };
 
+class SetIdentityMatrix44Bench : public Matrix44Bench {
+public:
+    SetIdentityMatrix44Bench(void* param) : INHERITED(param, "setidentity") {
+        double rowMajor[16] =
+                { 1, 2, 3, 4,
+                  5, 6, 7, 8,
+                  9, 10, 11, 12,
+                  13, 14, 15, 16};
+        mat.setRowMajord(rowMajor);
+    }
+protected:
+    virtual void performTest() {
+        for (int i = 0; i < 10; ++i) {
+            mat.setIdentity();
+        }
+    }
+private:
+    SkMatrix44 mat;
+    typedef Matrix44Bench INHERITED;
+};
+
 class PreScaleMatrix44Bench : public Matrix44Bench {
 public:
     PreScaleMatrix44Bench(void* param) : INHERITED(param, "prescale") {
         fX = fY = fZ = SkDoubleToMScalar(1.5);
     }
 protected:
     virtual void performTest() {
         fM0.reset();
         for (int i = 0; i < 10; ++i) {
             fM0.preScale(fX, fY, fZ);
@@ skipping 154 matching lines @@
         for (int i = 0; i < 20; ++i) {
             fMatrix.set(1, 2, 1);   // to invalidate the type-cache
             fMatrix.getType();
         }
     }
 private:
     SkMatrix44 fMatrix;
     typedef Matrix44Bench INHERITED;
 };
 
+DEF_BENCH( return new SetIdentityMatrix44Bench(p); )
 DEF_BENCH( return new EqualsMatrix44Bench(p); )
 DEF_BENCH( return new PreScaleMatrix44Bench(p); )
 DEF_BENCH( return new PostScaleMatrix44Bench(p); )
 DEF_BENCH( return new InvertMatrix44Bench(p); )
 DEF_BENCH( return new InvertAffineMatrix44Bench(p); )
 DEF_BENCH( return new InvertScaleTranslateMatrix44Bench(p); )
 DEF_BENCH( return new InvertTranslateMatrix44Bench(p); )
 DEF_BENCH( return new SetConcatMatrix44Bench(p); )
 DEF_BENCH( return new GetTypeMatrix44Bench(p); )