Elements with an ARIA role of treeitem should be able to get their accessible name from their conte…

third_party/WebKit/LayoutTests/inspector-protocol/accessibility/accessibility-ignoredNodes-expected.txt

 Non-hidden div for comparison
 non-hidden treeitem
 hidden non-treeitem
  Buttons are leaf nodes
 Descendant of aria-hidden node
 
 List item also presentational
 Div in list isn't presentational
 Content within label refers to label container   
 {
@@ skipping 33 matching lines @@
   "result": {
     "accessibilityNode": {
       "nodeId": "<string>",
       "ignored": false,
       "role": {
         "type": "role",
         "value": "treeitem"
       },
       "name": {
         "type": "computedString",
-        "value": "",
+        "value": "non-hidden treeitem",
         "sources": [
           {
             "type": "relatedElement",
             "attribute": "aria-labelledby"
           },
           {
             "type": "attribute",
             "attribute": "aria-label"
           },
           {
+            "type": "contents",
+            "value": {
+              "type": "computedString",
+              "value": "non-hidden treeitem"
+            }
+          },
+          {
             "type": "attribute",
-            "attribute": "title"
+            "attribute": "title",
+            "superseded": true
           }
         ]
       },
       "properties": [
         {
           "name": "level",
           "value": {
             "type": "integer",
             "value": 1
           }
@@ skipping 347 matching lines @@
         }
       ],
       "role": {
         "type": "internalRole",
         "value": "Canvas"
       }
     }
   }
 }