Rewrite the layout test for DOMRect interface.

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 7665b4d97dddf4c1ee2c5b32e2593f7b4294a850..440a07442ac6551820e25cef32d80fa72c3bce16 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
@@ -80,4 +80,30 @@ function assert_dom_point_equals(actual, expected) {
   } else {
     assert_unreached();
   }
+}
+ 
+function assert_dom_rect_equals(actual, expected) {
+  assert_true(actual instanceof DOMRectReadOnly);
+  if(Array.isArray(expected)) {
+    assert_equals(expected.length, 8);
+    assert_equals(actual.x, expected[0], "rect equality: x differs");
+    assert_equals(actual.y, expected[1], "rect equality: y differs");
+    assert_equals(actual.width, expected[2], "rect equality: width differs");
+    assert_equals(actual.height, expected[3], "rect equality: height differs");
+    assert_equals(actual.top, expected[4], "rect equality: top differs");
+    assert_equals(actual.right, expected[5], "rect equality: right differs");
+    assert_equals(actual.bottom, expected[6], "rect equality: bottom differs");
+    assert_equals(actual.left, expected[7], "rect equality: left differs");
+  } else if(expected instanceof DOMRectReadOnly) {
+    assert_equals(actual.x, expected.x, "rect equality: x differs");
+    assert_equals(actual.y, expected.y, "rect equality: y differs");
+    assert_equals(actual.width, expected.width, "rect equality: width differs");
+    assert_equals(actual.height, expected.height, "rect equality: height differs");
+    assert_equals(actual.top, expected.top, "rect equality: top differs");
+    assert_equals(actual.right, expected.right, "rect equality: right differs");
+    assert_equals(actual.bottom, expected.bottom, "rect equality: bottom differs");
+    assert_equals(actual.left, expected.left, "poirectnt equality: left differs");
+  } else {
+    assert_unreached();
+  }
 }