Change random number generator for tests to SkMWCRandom

src/core/SkMatrix.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMatrix.h"
 #include "Sk64.h"
 #include "SkFloatBits.h"
@@ skipping 1790 matching lines @@
     SkScalar c = SkScalarMul(fMat[kMSkewX],  fMat[kMSkewX]) +
                  SkScalarMul(fMat[kMScaleY], fMat[kMScaleY]);
     // eigenvalues of A^T*A are the squared singular values of A.
     // characteristic equation is det((A^T*A) - l*I) = 0
     // l^2 - (a + c)l + (ac-b^2)
     // solve using quadratic equation (divisor is non-zero since l^2 has 1 coeff
     // and roots are guaraunteed to be pos and real).
     SkScalar largerRoot;
     SkScalar bSqd = SkScalarMul(b,b);
     // if upper left 2x2 is orthogonal save some math
-    if (bSqd <= SK_ScalarNearlyZero) {
+    if (bSqd <= SK_ScalarNearlyZero*SK_ScalarNearlyZero) {
         largerRoot = SkMaxScalar(a, c);
     } else {
         SkScalar aminusc = a - c;
         SkScalar apluscdiv2 = SkScalarHalf(a + c);
         SkScalar x = SkScalarHalf(SkScalarSqrt(SkScalarMul(aminusc, aminusc) + 4 * bSqd));
         largerRoot = apluscdiv2 + x;
     }
     return SkScalarSqrt(largerRoot);
 }
 
@@ skipping 102 matching lines @@
         dst.fLeft *= scale;
         dst.fTop *= scale;
         dst.fRight *= scale;
         dst.fBottom *= scale;
     }
 
     SkIRect idst;
     dst.round(&idst);
     return isrc == idst;
 }