Bug 1519577 Update devtools test to use a test-only xbl binding r=jdescottes

Differential Revision: https://phabricator.services.mozilla.com/D31938

--HG--
extra : moz-landing-system : lando

devtools/client/inspector/markup/test/browser_markup_anonymous_02.js

@@ -12,14 +12,14 @@ const TEST_URL = URL_ROOT + "doc_markup_anonymous_xul.xul";
 add_task(async function() {
   const {inspector} = await openInspectorForURL(TEST_URL);
 
-  const toolbarbutton = await getNodeFront("toolbarbutton", inspector);
-  const children = await inspector.walker.children(toolbarbutton);
+  const boundNode = await getNodeFront("#xbl-host", inspector);
+  const children = await inspector.walker.children(boundNode);
 
-  is(toolbarbutton.numChildren, 4, "Correct number of children");
-  is(children.nodes.length, 4, "Children returned from walker");
+  is(boundNode.numChildren, 2, "Correct number of children");
+  is(children.nodes.length, 2, "Children returned from walker");
 
-  is(toolbarbutton.isAnonymous, false, "Toolbarbutton is not anonymous");
-  await isEditingMenuEnabled(toolbarbutton, inspector);
+  is(boundNode.isAnonymous, false, "Node with XBL binding is not anonymous");
+  await isEditingMenuEnabled(boundNode, inspector);
 
   for (const node of children.nodes) {
     ok(node.isAnonymous, "Child is anonymous");

devtools/client/inspector/markup/test/doc_markup_anonymous_xul.xul

@@ -3,6 +3,15 @@
 <xul:window xmlns="http://www.w3.org/1999/xhtml"
             xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
             title="Test anonymous xul nodes.">
-  <xul:toolbarbutton id="test"></xul:toolbarbutton>
+  <xbl:bindings xmlns:xbl="http://www.mozilla.org/xbl"
+                xmlns:xul="http://www.mozilla.org/keymaster/gaktekeeper/there.is.only.xul">
+    <xbl:binding id="test">
+      <xbl:content>
+        <xul:box anonid="xbl-anon1">Anonymous</xul:box>
+        <xul:box anonid="xbl-anon2">Anonymous</xul:box>
+      </xbl:content>
+    </xbl:binding>
+  </xbl:bindings>
+  <box id="xbl-host" style="-moz-binding: url(#test)"/>
 </xul:window>