Enable accessible name of a control to include multiple <label> elements.

third_party/WebKit/LayoutTests/inspector-protocol/accessibility/accessibility-nameSources-input-expected.txt

Index: third_party/WebKit/LayoutTests/inspector-protocol/accessibility/accessibility-nameSources-input-expected.txt
diff --git a/third_party/WebKit/LayoutTests/inspector-protocol/accessibility/accessibility-nameSources-input-expected.txt b/third_party/WebKit/LayoutTests/inspector-protocol/accessibility/accessibility-nameSources-input-expected.txt
index 993e7201bb3b300ec648e19f76ae96394516e556..b8a6168ec4535d92612b7856976429ab55b953da 100644
--- a/third_party/WebKit/LayoutTests/inspector-protocol/accessibility/accessibility-nameSources-input-expected.txt
+++ b/third_party/WebKit/LayoutTests/inspector-protocol/accessibility/accessibility-nameSources-input-expected.txt
@@ -769,7 +769,7 @@
       },
       "name": {
         "type": "computedString",
-        "value": "label-for-text9",
+        "value": "label-for-text9 label-wrapping-text9",
         "sources": [
           {
             "type": "relatedElement",
@@ -783,15 +783,19 @@
             "type": "relatedElement",
             "value": {
               "type": "computedString",
-              "value": "label-for-text9"
+              "value": "label-for-text9 label-wrapping-text9"
             },
-            "nativeSource": "labelfor",
+            "nativeSource": "labelwrapped",
             "nativeSourceValue": {
               "type": "nodeList",
               "relatedNodes": [
                 {
                   "backendNodeId": "<string>",
                   "text": "label-for-text9"
+                },
+                {
+                  "backendNodeId": "<string>",
+                  "text": "label-wrapping-text9"
                 }
               ]
             }
@@ -861,6 +865,10 @@
               {
                 "text": "label-for-text9",
                 "nodeResult": "label"
+              },
+              {
+                "text": "label-wrapping-text9",
+                "nodeResult": "label"
               }
             ]
           }
@@ -895,7 +903,7 @@
             "type": "relatedElement",
             "value": {
               "type": "computedString",
-              "value": "label-wrapping-text10"
+              "value": "label-wrapping-text10 "
             },
             "nativeSource": "labelwrapped",
             "nativeSourceValue": {
@@ -903,7 +911,7 @@
               "relatedNodes": [
                 {
                   "backendNodeId": "<string>",
-                  "text": "label-wrapping-text10"
+                  "text": "label-wrapping-text10 "
                 }
               ]
             }
@@ -971,7 +979,111 @@
             "type": "nodeList",
             "relatedNodes": [
               {
-                "text": "label-wrapping-text10",
+                "text": "label-wrapping-text10 ",
+                "nodeResult": "label"
+              }
+            ]
+          }
+        }
+      ]
+    }
+  }
+}
+{
+  "id": "<int>",
+  "result": {
+    "accessibilityNode": {
+      "nodeId": "<string>",
+      "ignored": false,
+      "role": {
+        "type": "role",
+        "value": "textbox"
+      },
+      "name": {
+        "type": "computedString",
+        "value": "first-label-for-text11 second-label-for-text11",
+        "sources": [
+          {
+            "type": "relatedElement",
+            "attribute": "aria-labelledby"
+          },
+          {
+            "type": "attribute",
+            "attribute": "aria-label"
+          },
+          {
+            "type": "relatedElement",
+            "value": {
+              "type": "computedString",
+              "value": "first-label-for-text11 second-label-for-text11"
+            },
+            "nativeSource": "labelfor",
+            "nativeSourceValue": {
+              "type": "nodeList",
+              "relatedNodes": [
+                {
+                  "backendNodeId": "<string>",
+                  "text": "first-label-for-text11"
+                },
+                {
+                  "backendNodeId": "<string>",
+                  "text": "second-label-for-text11"
+                }
+              ]
+            }
+          },
+          {
+            "type": "placeholder",
+            "attribute": "placeholder",
+            "superseded": true
+          },
+          {
+            "type": "attribute",
+            "attribute": "title",
+            "superseded": true
+          }
+        ]
+      },
+      "properties": [
+        {
+          "name": "invalid",
+          "value": {
+            "type": "token",
+            "value": "false"
+          }
+        },
+        {
+          "name": "multiline",
+          "value": {
+            "type": "boolean",
+            "value": false
+          }
+        },
+        {
+          "name": "readonly",
+          "value": {
+            "type": "boolean",
+            "value": false
+          }
+        },
+        {
+          "name": "required",
+          "value": {
+            "type": "boolean",
+            "value": false
+          }
+        },
+        {
+          "name": "labelledby",
+          "value": {
+            "type": "nodeList",
+            "relatedNodes": [
+              {
+                "text": "first-label-for-text11",
+                "nodeResult": "label"
+              },
+              {
+                "text": "second-label-for-text11",
                 "nodeResult": "label"
               }
             ]