Propagate origin, tainted origin flag, and URL list through the reque…

…st constructor. (Fixes whatwg#1321, whatwg#1335)

fetch.bs

@@ -6882,7 +6882,7 @@ constructor steps are:
    <dd><var>request</var>'s <a for=request>priority</a>.
 
    <dt><a for=request>origin</a>
-   <dd>"<code>client</code>".
+   <dd><var>request</var>'s <a for=request>origin</a>.
 
    <dt><a for=request>referrer</a>
    <dd><var>request</var>'s <a for=request>referrer</a>.
@@ -6913,6 +6913,12 @@ constructor steps are:
 
    <dt><a for=request>history-navigation flag</a>
    <dd><var>request</var>'s <a for=request>history-navigation flag</a>.
+
+   <dt><a for=request>tainted origin flag</a>
+   <dd><var>request</var>'s <a for=request>tainted origin flag</a>.
+
+   <dt><a for=request>URL list</a>
+   <dd>A <a for=list>clone</a> of <var>request</var>'s <a for=request>URL list</a>.
   </dl>
 
  <li>
@@ -6927,10 +6933,21 @@ constructor steps are:
 
    <li><p>Unset <var>request</var>'s <a for=request>history-navigation flag</a>.
 
+   <li><p>Set <var>request</var>'s <a for=request>origin</a> to
+   "<code>client</code>"
+
    <li><p>Set <var>request</var>'s <a for=request>referrer</a> to
    "<code>client</code>"
 
    <li><p>Set <var>request</var>'s <a for=request>referrer policy</a> to the empty string.
+
+   <li><p>Unset <var>request</var>'s <a for=request>tainted origin flag</a>.
+
+   <li><p>Set <var>request</var>'s <a for=request>URL list</a> to an empty
+   <a for=/>list</a>.
+
+   <li><p><a for=list>Append</a> <var>request</var>'s <a for=request>URL</a> to
+   <var>request</var>'s <a for=request>URL list</a>.
   </ol>
 
   <p class=note>This is done to ensure that when a service worker "redirects" a request, e.g., from