[GeometryInterface] Add rotateAxisAngle*(x,y,z,angle) function.

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

 function assert_identity_2d_matrix(actual) {
   assert_true(actual instanceof DOMMatrixReadOnly);
   assert_true(actual.is2D, "is2D");
   assert_true(actual.isIdentity, "isIdentity");
   assert_identity_matrix(actual);
 }
 
 function assert_identity_3d_matrix(actual) {
   assert_true(actual instanceof DOMMatrixReadOnly);
   assert_false(actual.is2D, "is2D");
@@ skipping 35 matching lines @@
   assert_equals(16, expected.length, "expected.length");
   assert_false(actual.is2D, "is2D");
   assert_false(actual.isIdentity, "isIdentity");
   assert_array_equals(toArray(actual), [
     expected[0], expected[1], expected[2], expected[3],
     expected[4], expected[5], expected[6], expected[7],
     expected[8], expected[9], expected[10], expected[11],
     expected[12], expected[13], expected[14], expected[15],
   ]);
 }
+
+function assert_array_almost_equals(actual, expected) {
+  for (var i = 0; i < actual.length; i++) {
+    assert_equals(actual[i].toFixed(10), expected[i].toFixed(10));
+  }
+}
+
+function assert_matrix_almost_equals(actual, expected) {
+  assert_array_almost_equals(actual.toFloat64Array(), expected.toFloat64Array());
+}