minor #30130 [WebProfilerBundle] Add ajax request number (Antoine Lamirault)

This PR was merged into the 4.3-dev branch.

Discussion
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[WebProfilerBundle] Add ajax request number

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #30121
| License       | MIT

Add request number foreach ajax call in profiler.
![screenshot_2019-02-10_18-54-02](https://user-images.githubusercontent.com/9253091/52537598-c830c980-2d68-11e9-815e-90345b6bbd88.png)

Commits
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70a38cfdfd [WebProfilerBundle] Add ajax request number

src/Symfony/Bundle/WebProfilerBundle/Resources/views/Collector/ajax.html.twig

@@ -14,6 +14,7 @@
             <table class="sf-toolbar-ajax-requests">
                 <thead>
                     <tr>
+                        <th>#</th>
                         <th>Profile</th>
                         <th>Method</th>
                         <th>Type</th>

src/Symfony/Bundle/WebProfilerBundle/Resources/views/Profiler/base_js.html.twig

@@ -136,6 +136,10 @@
             var row = document.createElement('tr');
             request.DOMNode = row;
 
+            var requestNumberCell = document.createElement('td');
+            requestNumberCell.textContent = index + 1;
+            row.appendChild(requestNumberCell);
+
             var profilerCell = document.createElement('td');
             profilerCell.textContent = 'n/a';
             row.appendChild(profilerCell);