[GeometryInterface] add transformPoint(point) function.

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

Index: third_party/WebKit/LayoutTests/fast/dom/resources/geometry-interfaces-test-helpers.js
diff --git a/third_party/WebKit/LayoutTests/fast/dom/resources/geometry-interfaces-test-helpers.js b/third_party/WebKit/LayoutTests/fast/dom/resources/geometry-interfaces-test-helpers.js
index ee27f2b8f05134cf2c02c7b46560e6d2371be44b..6cfa0f38676a1d419498d6c8aeccc48e63288582 100644
--- a/third_party/WebKit/LayoutTests/fast/dom/resources/geometry-interfaces-test-helpers.js
+++ b/third_party/WebKit/LayoutTests/fast/dom/resources/geometry-interfaces-test-helpers.js
@@ -63,3 +63,10 @@ function assert_array_almost_equals(actual, expected) {
 function assert_matrix_almost_equals(actual, expected) {
   assert_array_almost_equals(actual.toFloat64Array(), expected.toFloat64Array());
 }
+
+function assert_point_equals(actual, expected) {
+  assert_equals(actual.x, expected.x, "actual.x is different with expected.x");
+  assert_equals(actual.y, expected.y, "actual.y is different with expected.y");
+  assert_equals(actual.z, expected.z, "actual.z is different with expected.z");
+  assert_equals(actual.w, expected.w, "actual.w is different with expected.w");
+}