[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, 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 42 matching lines @@
   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);
 }
+
+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));
+  }
+}