make setScaleTranslate public

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 921 matching lines @@
     REPORTER_ASSERT(reporter, !are_equal(reporter, mat, mat2));
 
     test_matrix_min_max_scale(reporter);
     test_matrix_preserve_shape(reporter);
     test_matrix_recttorect(reporter);
     test_matrix_decomposition(reporter);
     test_matrix_homogeneous(reporter);
     test_set9(reporter);
 
     test_decompScale(reporter);
+
+    mat.setScaleTranslate(2, 3, 1, 4);
+    mat2.setScale(2, 3);
+    mat2.postTranslate(1, 4);
+    REPORTER_ASSERT(reporter, mat == mat2);
 }
 
 DEF_TEST(Matrix_Concat, r) {
     SkMatrix a;
     a.setTranslate(10, 20);
 
     SkMatrix b;
     b.setScale(3, 5);
 
     SkMatrix expected;
@@ skipping 20 matching lines @@
         
         mat.mapPoints((SkPoint*)&dst[0].fLeft, (SkPoint*)&src.fLeft, 2);
         dst[0].sort();
         mat.mapRect(&dst[1], src);
         mat.mapRectScaleTranslate(&dst[2], src);
 
         REPORTER_ASSERT(r, dst[0] == dst[1]);
         REPORTER_ASSERT(r, dst[0] == dst[2]);
     }
 }