Adding fromRect to DOMRect and DOMRectReadOnly interfaces following spec.

third_party/WebKit/LayoutTests/fast/dom/geometry-interfaces-dom-rect.html

Index: third_party/WebKit/LayoutTests/fast/dom/geometry-interfaces-dom-rect.html
diff --git a/third_party/WebKit/LayoutTests/fast/dom/geometry-interfaces-dom-rect.html b/third_party/WebKit/LayoutTests/fast/dom/geometry-interfaces-dom-rect.html
index 611e2b774797af65c7648d88ac0252efd2fd7604..78e9871a05c686342ed23d02aa099a7e8a04b68a 100644
--- a/third_party/WebKit/LayoutTests/fast/dom/geometry-interfaces-dom-rect.html
+++ b/third_party/WebKit/LayoutTests/fast/dom/geometry-interfaces-dom-rect.html
@@ -57,6 +57,35 @@ test(() => {
 }, 'DOMRect setter');
 
 test(() => {
+  var rect = DOMRect.fromRect({x: 10, y: 20, width: 80, height: 50});
+  assert_dom_rect_equals(rect, [10, 20, 80, 50, 20, 90, 70, 10]);
+}, 'DOMRect.fromRect({x: 10, y: 20, width: 80, height: 50}) should create a DOMRect');
+
+test(() => {
+  var rect = DOMRect.fromRect();
+  assert_dom_rect_equals(rect, [0, 0, 0, 0, 0, 0, 0, 0]);
+}, 'DOMRect.fromRect({x: 0, y: 0, width: 0, height: 0}) should create a DOMRect');
+
+test(() => {
+  var rect = DOMRect.fromRect({x: 10, y: 20, width: 80, height: 50});
+  rect.x = 30;
+  assert_dom_rect_equals(rect, [30, 20, 80, 50, 20, 110, 70, 30]);
+  rect.y = -10;
+  assert_dom_rect_equals(rect, [30, -10, 80, 50, -10, 110, 40, 30]);
+  rect.width = 20;
+  assert_dom_rect_equals(rect, [30, -10, 20, 50, -10, 50, 40, 30]);
+  rect.height = 40;
+  assert_dom_rect_equals(rect, [30, -10, 20, 40, -10, 50, 30, 30]);
+}, 'DOMRect.fromRect({x: 10, y: 20, width: 80, height: 50}) should create a DOMRect and the values can be changed');
+
+test(() => {
+  var rect1 = DOMRect.fromRect();
+  var rect2 = DOMRect.fromRect();
+  assert_false(rect1 == rect2);
+  assert_dom_rect_equals(rect1, rect2);
+}, 'DOMRect.fromRect() should create a new DOMRect');
+
+test(() => {
   var rect = new DOMRectReadOnly();
   assert_dom_rect_equals(rect, [0, 0, 0, 0, 0, 0, 0, 0]);
 }, 'DOMRectReadOnly constructor without parameter');
@@ -94,4 +123,29 @@ test(() => {
   assert_object_equals(rect.toJSON(), {x: 10, y: 20, width: 80, height: 50, top: 20, right: 90, bottom: 70, left: 10});
 }, 'DOMRectReadOnly toJSON');
 
+test(() => {
+  var rect = DOMRectReadOnly.fromRect({x: 10, y: 20, width: 80, height: 50});
+  assert_dom_rect_equals(rect, [10, 20, 80, 50, 20, 90, 70, 10]);
+}, 'DOMRectReadOnly.fromRect({x: 10, y: 20, width: 80, height: 50}) should create a DOMRectReadOnly');
+
+test(() => {
+  var rect = DOMRectReadOnly.fromRect();
+  assert_dom_rect_equals(rect, [0, 0, 0, 0, 0, 0, 0, 0]);
+}, 'DOMRectReadOnly.fromRect({x: 0, y: 0, width: 0, height: 0}) should create a DOMRectReadOnly');
+
+test(() => {
+  var rect1 = DOMRectReadOnly.fromRect();
+  var rect2 = DOMRectReadOnly.fromRect();
+  assert_false(rect1 == rect2);
+  assert_dom_rect_equals(rect1, rect2);
+}, 'DOMRectReadOnly.fromRect() should create a new DOMRectReadOnly');
+
+test(() => {
+  var rect = DOMRectReadOnly.fromRect();
+  assert_readonly(rect, 'x');
+  assert_readonly(rect, 'y');
+  assert_readonly(rect, 'width');
+  assert_readonly(rect, 'height');
+}, "DOMRectReadOnly.fromRect() should create DOMRectReadOnly");
+
 </script>