title: Gmail contextual gadget recipientToScope not being passed
body: <p>In my Gmail contextual gadget, I can obtain the "From" address, but not the "To" address(es).</p>
  
  <p>Here are my extractors from the manifest file:</p>
  
  <pre><code>&lt;Extension id="ex1" type="contextExtractor"&gt;
      &lt;Name&gt;Email Recipient&lt;/Name&gt;
      &lt;Url&gt;google.com:RecipientToEmailExtractor&lt;/Url&gt;
      &lt;Param name="to_email" value=".*"/&gt;
      &lt;Triggers ref="MyGadget"/&gt;
      &lt;Scope ref="recipientToScope"/&gt;
      &lt;Container name="mail"/&gt;
  &lt;/Extension&gt;
  
  &lt;Extension id="ex2" type="contextExtractor"&gt;
      &lt;Name&gt;Email Sender&lt;/Name&gt;
      &lt;Url&gt;google.com:SenderEmailExtractor&lt;/Url&gt;
      &lt;Param name="sender_email" value=".*"/&gt;
      &lt;Triggers ref="MyGadget"/&gt;
      &lt;Scope ref="senderScope"/&gt;
      &lt;Container name="mail"/&gt;
  &lt;/Extension&gt;
  </code></pre>
  
  <p>And my scopes:</p>
  
  <pre><code>&lt;Scope id="recipientToScope"&gt;
      &lt;Url&gt;tag:google.com,2010:auth/contextual/extractor/TO_ADDRESS&lt;/Url&gt;
      &lt;Reason&gt;Extracts the To address of each email&lt;/Reason&gt;
  &lt;/Scope&gt;
  
  &lt;Scope id="senderScope"&gt;
      &lt;Url&gt;tag:google.com,2010:auth/contextual/extractor/FROM_ADDRESS&lt;/Url&gt;
      &lt;Reason&gt;Extracts the From address of each email&lt;/Reason&gt;
  &lt;/Scope&gt;
  </code></pre>
  
  <p>In my Gmail gadget spec file I am using type="url" for the gadget display:</p>
  
  <pre><code>&lt;Content type="url" href="https://mysite.com/index.php" view="card" /&gt;
  </code></pre>
  
  <p>My extractors look like this:</p>
  
  <pre><code>&lt;Require feature="google.contentmatch"&gt;
      &lt;Param name="extractors"&gt;
          google.com:SenderEmailExtractor,google.com:RecipientToEmailExtractor
      &lt;/Param&gt;
  &lt;/Require&gt;
  </code></pre>
  
  <p>The gadget iframe shows this as the source:</p>
  
  <pre><code>https://mysite.com/index.php
  ?container=gm
  &amp;view=card
  &amp;lang=en
  &amp;country=US
  &amp;sanitize=0
  &amp;v=748lk692ac9cad5
  &amp;rpctoken=6m5f54539a5
  &amp;libs=google.contentmatch%3Adynamic-height%3Acore%3Aauth-refresh
  &amp;parent=https%3A%2F%2Fmail.google.com%2Fa%2Fmyappsdomain.com%2Fhtml
  &amp;pid=myappsdomain.com
  &amp;mid=5
  &amp;st=e%3DAA6WCYaY5vubh897t87gyghygcilRyeq%252FivEo%252B%252BBqkpbGnn9ocC9fmLgVOVmzhXD5hX70ha9cXHC1UwIsD0ZDElClAACIfpVhHjieGnJSREZ%252B8eHCj%26c%3Dgm
  #cob=%257B%2522google.com%253ASenderEmailExtractor%2522%253A%255B%257B%2522sender_email%2522%253A%2522myemail%2540gmail.com%2522%257D%255D%257D
  </code></pre>
  
  <p>The last line (decoded) is this:</p>
  
  <pre><code>{"google.com:SenderEmailExtractor":[{"sender_email":"myemail@gmail.com"}]}
  </code></pre>
  
  <p>So <code>mysite.com/index.php</code> has access to that value. But it never shows the recipient's ("To") email address there.</p>
  
  <p>Anyone come across this before, and have any tips?</p>