Browser Plugin: Add HTML5-like postMessage support

content/test/data/browser_plugin_embedder.html

 <script type="text/javascript">
 function loadAbort(evt) {
   document.title = evt.type;
 }
 function loadStart(evt) {
   document.title = evt.url;
 }
 var redirectOldUrl;
 var redirectNewUrl;
 function loadRedirect(event) {
   document.title = "redirected";
   if (event.isTopLevel) {
     redirectOldUrl = event.oldUrl;
     redirectNewUrl = event.newUrl;
   }
 }
 function SetSrc(src) {
   var plugin = document.getElementById('plugin');
   plugin.src = src;
 }
 function SetSize(w, h) {
   var plugin = document.getElementById('plugin');
   plugin.width = w;
   plugin.height = h;
 }
+function PostMessage(data, shouldTargetIframe) {
+  plugin = document.getElementById('plugin');
+  // TODO(fsamuel): contentWindow can be accessed directly once
+  // http://wkbug.com/85679 lands.
+  if (shouldTargetIframe) {
+    plugin.contentWindow.frames[0].postMessage('testing123', '*');
+  } else {
+    plugin.contentWindow.frames.postMessage('testing123', '*');
+  }
+}
 function Back() {
   var plugin = document.getElementById('plugin');
   plugin.back();
 }
 function CanGoBack() {
   var plugin = document.getElementById('plugin');
   return plugin.canGoBack();
 }
 function CanGoForward() {
   var plugin = document.getElementById('plugin');
@@ skipping 12 matching lines @@
 }
 document.title = 'embedder';
 </script>
 
 <object id="plugin"
     tabindex="0"
     type="application/browser-plugin"
     width="640"
     height="480"
     border="0px"></object>
-
-<script>
+<script type="text/javascript">
+var msg;
+function receiveMessage(event) {
+  msg = event.data;
+  if (msg == 'ready') {
+    document.title = 'ready';
+    return;
+  }
+  if (msg.indexOf('stop_ack') == -1) {
+    event.source.postMessage('stop', '*');
+  } else {
+    var name = msg.replace("stop_ack", "").trim();
+    if (name !== '') {
+      window.document.title = name;
+    } else {
+      window.document.title = 'main guest';
+    }
+  }
+}
   var plugin = document.getElementById('plugin');
   plugin.addEventListener('loadStart', loadStart);
   plugin.addEventListener('loadAbort', loadAbort);
   plugin.addEventListener('loadRedirect', loadRedirect);
+  window.addEventListener('message', receiveMessage, false);
 </script>