Queue Custom Element attribute changes arising from style mutations.

third_party/WebKit/LayoutTests/fast/dom/custom/attribute-changed-callback.html

Index: third_party/WebKit/LayoutTests/fast/dom/custom/attribute-changed-callback.html
diff --git a/third_party/WebKit/LayoutTests/fast/dom/custom/attribute-changed-callback.html b/third_party/WebKit/LayoutTests/fast/dom/custom/attribute-changed-callback.html
index 195b1ae4e597a320827dba4864a67a48ddb4fd26..cef755d67081a5b5f4062923a67e00df2bf5be01 100644
--- a/third_party/WebKit/LayoutTests/fast/dom/custom/attribute-changed-callback.html
+++ b/third_party/WebKit/LayoutTests/fast/dom/custom/attribute-changed-callback.html
@@ -71,5 +71,25 @@ test(function () {
     invocations = [];
     b.setAttribute('data-v', 'x');
     assert_array_equals(invocations, [], 'setting an attribute to the existing value with setAttribute should not invoke the attributeChangedCallback');
+
+    invocations = [];
+    b.style.color = 'red';
+    assert_array_equals(invocations, ['style: null => color: red;'], 'changing an attribute with the styles object\'s named setter should invoke the attributeChangedCallback');
+
+    invocations = [];
+    b.style.color = '';
+    assert_array_equals(invocations, ['style: color: red; => null'], 'changing an attribute with the styles object\'s named setter should invoke the attributeChangedCallback');
+
+    invocations = [];
+    b.style.cssText = 'color: pink;';
+    assert_array_equals(invocations, ['style: null => color: pink;'], 'changing an attribute with the styles object\'s cssText setter should invoke the attributeChangedCallback');
+
+    invocations = [];
+    b.style.setProperty('color', 'red');
+    assert_array_equals(invocations, ['style: color: pink; => color: red;'], 'changing an attribute with the styles object\'s setProperty method should invoke the attributeChangedCallback');
+
+    invocations = [];
+    b.style.removeProperty('color');
+    assert_array_equals(invocations, ['style: color: red; => null'], 'changing an attribute with the styles object\'s removeProperty method should invoke the attributeChangedCallback');
 }, 'add, change and remove an attribute');
 </script>