Bug 1496476 - add tabContextChanged stub. r=standard8

browser/components/urlbar/UrlbarController.jsm

@@ -146,6 +146,14 @@ class UrlbarController {
     this._listeners.delete(listener);
   }
 
+  /**
+   * When switching tabs, clear some internal caches to handle cases like
+   * backspace, autofill or repeated searches.
+   */
+  tabContextChanged() {
+    // TODO: implementation needed (bug 1496685)
+  }
+
   /**
    * Internal function to notify listeners of results.
    *

browser/components/urlbar/UrlbarInput.jsm

@@ -414,6 +414,10 @@ class UrlbarInput {
   _on_scrollend(event) {
     this._updateTextOverflow();
   }
+
+  _on_TabSelect(event) {
+    this.controller.tabContextChanged();
+  }
 }
 
 /**