add round/ceil/etc. for SkMScalar

tests/Matrix44Test.cpp

Index: tests/Matrix44Test.cpp
diff --git a/tests/Matrix44Test.cpp b/tests/Matrix44Test.cpp
index 75dd5181d4c6df0767fdc0e38ac2cd7c66d84175..13ead192b3609e022c968fbf9727c868f0f7c736 100644
--- a/tests/Matrix44Test.cpp
+++ b/tests/Matrix44Test.cpp
@@ -761,6 +761,21 @@ static void test_preserves_2d_axis_alignment(skiatest::Reporter* reporter) {
   test(true, reporter, transform);
 }
 
+// just want to exercise the various converters for MScalar
+static void test_toint(skiatest::Reporter* reporter) {
+    SkMatrix44 mat(SkMatrix44::kUninitialized_Constructor);
+    mat.setScale(3, 3, 3);
+
+    SkMScalar sum = SkMScalarFloor(mat.get(0, 0)) +
+                    SkMScalarRound(mat.get(1, 0)) +
+                    SkMScalarCeil(mat.get(2, 0));
+    int isum =      SkMScalarFloorToInt(mat.get(0, 1)) +
+                    SkMScalarRoundToInt(mat.get(1, 2)) +
+                    SkMScalarCeilToInt(mat.get(2, 3));
+    REPORTER_ASSERT(reporter, sum >= 0);
+    REPORTER_ASSERT(reporter, isum >= 0);
+    REPORTER_ASSERT(reporter, static_cast<SkMScalar>(isum) == SkIntToMScalar(isum));
+}
 
 DEF_TEST(Matrix44, reporter) {
     SkMatrix44 mat(SkMatrix44::kUninitialized_Constructor);
@@ -869,4 +884,5 @@ DEF_TEST(Matrix44, reporter) {
     test_3x3_conversion(reporter);
     test_has_perspective(reporter);
     test_preserves_2d_axis_alignment(reporter);
+    test_toint(reporter);
 }