Expose html attributes in automation tree.

chrome/test/data/extensions/api_test/automation/tests/tabs/attributes.js

Index: chrome/test/data/extensions/api_test/automation/tests/tabs/attributes.js
diff --git a/chrome/test/data/extensions/api_test/automation/tests/tabs/attributes.js b/chrome/test/data/extensions/api_test/automation/tests/tabs/attributes.js
index 814190df203448390f3eb91e170963e87e9dd39e..3f4e538c639c8036f3bc7dda8fbe4e83f6b775a1 100644
--- a/chrome/test/data/extensions/api_test/automation/tests/tabs/attributes.js
+++ b/chrome/test/data/extensions/api_test/automation/tests/tabs/attributes.js
@@ -242,6 +242,13 @@ var allTests = [
       assertFalse(attributeAttr in div);
     }
     chrome.test.succeed();
+  },
+
+  function testHtmlAttributes() {
+    var editable = rootNode.find({ role: 'textField' });
+    assertTrue(editable !== undefined);
+    assertEq('text', editable.htmlAttributes.type);
+    chrome.test.succeed();
   }
 ];