Draw attention to windows on new messages

js/chromium.js

@@ -141,6 +141,12 @@
             } else {
                 window.addEventListener('beforeunload', callback);
             }
+        },
+
+        drawAttention: function(window_id) {
+            if (chrome.app.window) {
+                chrome.app.window.get(window_id).drawAttention();
+            }
         }
 
     };

js/panel_controller.js

@@ -65,7 +65,10 @@
             });
             conversation.fetchMessages();
         } else {
-            openConversation(message.get('conversationId'));
+            var conversationId = message.get('conversationId');
+            openConversation(conversationId);
+            var windowId = windowMap.windowIdFrom(conversationId);
+            extension.windows.drawAttention(windowId);
         }
     };