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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [Threaded Compositor] Content and viewport sizes are mixed"
   href="https://bugs.webkit.org/show_bug.cgi?id=158564">158564</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[Threaded Compositor] Content and viewport sizes are mixed
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Local Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Keywords</th>
          <td>Gtk
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>WebKit2
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>cgarcia&#64;igalia.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>bugs-noreply&#64;webkitgtk.org, yoon&#64;igalia.com, zan&#64;falconsigh.net
          </td>
        </tr></table>
      <p>
        <div>
        <pre>So, in ThreadedCoordinatedLayerTreeHost we have:

 - sizeDidChange: called when the main frame contents size changes, but that changes also the coordinator size
 - viewportSizeChanged: called when the viewport size changes, but doesn't change the coordinator size

this is very confusing not only because we are mixing both sizes, but also because sizeDidChange is used in all other layer tree host implementations as the viewport size.</pre>
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