Temporarily adjust Matrix.isSimilarity test tolerance on 64-bit ARM devices

tests/MatrixTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMath.h"
 #include "SkMatrix.h"
 #include "SkMatrixUtils.h"
@@ skipping 302 matching lines @@
 
     // perspective y
     mat.reset();
     mat.setPerspY(SkScalarToPersp(SK_Scalar1 / 2));
     REPORTER_ASSERT(reporter, !mat.isSimilarity());
 
     // rotate
     for (int angle = 0; angle < 360; ++angle) {
         mat.reset();
         mat.setRotate(SkIntToScalar(angle));
+#ifndef SK_CPU_ARM64
         REPORTER_ASSERT(reporter, mat.isSimilarity());
+#else
+        // 64-bit ARM devices built with -O2 and -ffp-contract=fast have a loss
+        // of precision and require that we have a higher tolerance
+        REPORTER_ASSERT(reporter, mat.isSimilarity(SK_ScalarNearlyZero + 0.00010113f));
+#endif
     }
 
     // see if there are any accumulated precision issues
     mat.reset();
     for (int i = 1; i < 360; i++) {
         mat.postRotate(SkIntToScalar(1));
     }
     REPORTER_ASSERT(reporter, mat.isSimilarity());
 
     // rotate + translate
@@ skipping 486 matching lines @@
     a.setTranslate(10, 20);
 
     SkMatrix b;
     b.setScale(3, 5);
 
     SkMatrix expected;
     expected.setConcat(a,b);
 
     REPORTER_ASSERT(r, expected == SkMatrix::Concat(a, b));
 }