[GeometryInterface] Clean-up layout tests for geometry interfaces.

third_party/WebKit/LayoutTests/fast/dom/resources/geometry-interfaces-test-helpers.js

 function assert_identity_2d_matrix(actual, description) {
   assert_matrix_equals(actual, {
       m11: 1, m12: 0, m13: 0, m14: 0,
       m21: 0, m22: 1, m23: 0, m24: 0,
       m31: 0, m32: 0, m33: 1, m34: 0,
       m41: 0, m42: 0, m43: 0, m44: 1,
       is2D: true, isIdentity: true
   }, description);
 }
 
@@ skipping 41 matching lines @@
         is2D: false, isIdentity: false
     };
     assert_matrix_equals(actual, full_expected, description);
   } else {
     expected['is2D'] = false;
     expected['isIdentity'] = false;
     assert_matrix_equals(actual, expected, description);
   }
 }
 
+function assert_equals_do_not_care_native_zero(actual, expected, description) {
+
+  if (actual === -0) {
+    actual = 0;
+  }
+
+  if (expected === -0) {
+    expected = 0;
+  }
+
+  assert_equals(actual, expected, description);
+}
+
 function assert_matrix_equals(actual, expected, description) {

[zino, 2016/09/27 16:31:18]

Do we still need description?

-  assert_equals(actual.isIdentity, expected.isIdentity, description);
-  assert_equals(actual.is2D, expected.is2D, description);
-  assert_equals(actual.m11, expected.m11, description);
-  assert_equals(actual.m12, expected.m12, description);
-  assert_equals(actual.m13, expected.m13, description);
-  assert_equals(actual.m14, expected.m14, description);
-  assert_equals(actual.m21, expected.m21, description);
-  assert_equals(actual.m22, expected.m22, description);
-  assert_equals(actual.m23, expected.m23, description);
-  assert_equals(actual.m24, expected.m24, description);
-  assert_equals(actual.m31, expected.m31, description);
-  assert_equals(actual.m32, expected.m32, description);
-  assert_equals(actual.m33, expected.m33, description);
-  assert_equals(actual.m34, expected.m34, description);
-  assert_equals(actual.m41, expected.m41, description);
-  assert_equals(actual.m42, expected.m42, description);
-  assert_equals(actual.m43, expected.m43, description);
-  assert_equals(actual.m44, expected.m44, description);
-  assert_equals(actual.m11, actual.a, description);
-  assert_equals(actual.m12, actual.b, description);
-  assert_equals(actual.m21, actual.c, description);
-  assert_equals(actual.m22, actual.d, description);
-  assert_equals(actual.m41, actual.e, description);
-  assert_equals(actual.m42, actual.f, description);
+  assert_equals(actual.isIdentity, expected.isIdentity, "isIdentity");
+  assert_equals(actual.is2D, expected.is2D, "is2d");
+  assert_equals_do_not_care_native_zero(actual.m11, expected.m11, "m11");
+  assert_equals_do_not_care_native_zero(actual.m12, expected.m12, "m12");
+  assert_equals_do_not_care_native_zero(actual.m13, expected.m13, "m13");
+  assert_equals_do_not_care_native_zero(actual.m14, expected.m14, "m14");
+  assert_equals_do_not_care_native_zero(actual.m21, expected.m21, "m21");
+  assert_equals_do_not_care_native_zero(actual.m22, expected.m22, "m22");
+  assert_equals_do_not_care_native_zero(actual.m23, expected.m23, "m23");
+  assert_equals_do_not_care_native_zero(actual.m24, expected.m24, "m24");
+  assert_equals_do_not_care_native_zero(actual.m31, expected.m31, "m31");
+  assert_equals_do_not_care_native_zero(actual.m32, expected.m32, "m32");
+  assert_equals_do_not_care_native_zero(actual.m33, expected.m33, "m33");
+  assert_equals_do_not_care_native_zero(actual.m34, expected.m34, "m34");
+  assert_equals_do_not_care_native_zero(actual.m41, expected.m41, "m41");
+  assert_equals_do_not_care_native_zero(actual.m42, expected.m42, "m42");
+  assert_equals_do_not_care_native_zero(actual.m43, expected.m43, "m43");
+  assert_equals_do_not_care_native_zero(actual.m44, expected.m44, "m44");
+  assert_equals(actual.m11, actual.a, "a");
+  assert_equals(actual.m12, actual.b, "b");
+  assert_equals(actual.m21, actual.c, "c");
+  assert_equals(actual.m22, actual.d, "d");
+  assert_equals(actual.m41, actual.e, "e");
+  assert_equals(actual.m42, actual.f, "f");
 }