add hook for chat data

code/hooks.js

@@ -24,9 +24,15 @@
 //              the Leaflet CircleMarker for the portal in "portal" var.
 // portalDetailsUpdated: fired after the details in the sidebar have
 //              been (re-)rendered
+// publicChatDataAvailable: this hook runs after data for any of the
+//              public chats has been received and processed, but not
+//              yet been displayed. The data hash contains both the un-
+//              processed raw ajax response as well as the processed
+//              chat data that is going to be used for display.
 
 window._hooks = {}
-window.VALID_HOOKS = ['portalAdded', 'portalDetailsUpdated'];
+window.VALID_HOOKS = ['portalAdded', 'portalDetailsUpdated',
+  'publicChatDataAvailable'];
 
 window.runHooks = function(event, data) {
   if(VALID_HOOKS.indexOf(event) === -1) throw('Unknown event type: ' + event);