[DevTools] UI for blocked URLs.

Source/devtools/front_end/ui/FilterBar.js

Index: Source/devtools/front_end/ui/FilterBar.js
diff --git a/Source/devtools/front_end/ui/FilterBar.js b/Source/devtools/front_end/ui/FilterBar.js
index 333c93df852d2afde09213fa96db97d9950dcb8c..d4c2d557236949df3bd9fbb36049412def8ffe87 100644
--- a/Source/devtools/front_end/ui/FilterBar.js
+++ b/Source/devtools/front_end/ui/FilterBar.js
@@ -54,6 +54,10 @@ WebInspector.FilterBar.FilterBarState = {
     Shown : "shown"
 };
 
+WebInspector.FilterBar.Events = {
+    Toggled: "Toggled"
+};
+
 WebInspector.FilterBar.prototype = {
     /**
      * @return {!WebInspector.ToolbarButton}
@@ -148,6 +152,7 @@ WebInspector.FilterBar.prototype = {
                 }
             }
         }
+        this.dispatchEventToListeners(WebInspector.FilterBar.Events.Toggled);
     },
 
     clear: function()