This adds a webui overlay on the extensions page for showing what Extension keybindings are active.…

chrome/browser/resources/shared/js/load_time_data.js

Index: chrome/browser/resources/shared/js/load_time_data.js
===================================================================
--- chrome/browser/resources/shared/js/load_time_data.js	(revision 137495)
+++ chrome/browser/resources/shared/js/load_time_data.js	(working copy)
@@ -42,6 +42,9 @@
      */
     getValue: function(id) {
       expect(this.data_, 'No data. Did you remember to include strings.js?');
+      // If your value is not found here, inspect the contents of this.data_.
+      // If you find none of your values there, then make sure that
+      // GetLocalizedValues() in your handler class (in C++) is called.
       var value = this.data_[id];
       expect(typeof value != 'undefined', 'Could not find value for ' + id);
       return value;