Support automatically resolving dependencies in javascript tests.

chrome/test/data/webui/test_api.js

Index: chrome/test/data/webui/test_api.js
diff --git a/chrome/test/data/webui/test_api.js b/chrome/test/data/webui/test_api.js
index 07510ae3ee6ee0c226b702b4c5681704c12eeafa..2696d2b2ede4376bfb221f5dea68b136a61a4ec0 100644
--- a/chrome/test/data/webui/test_api.js
+++ b/chrome/test/data/webui/test_api.js
@@ -122,6 +122,17 @@ var testing = {};
     extraLibraries: [],
 
     /**
+     * Extra libraries to add before loading this test file.
+     * This list is in the form of Closure library style object
+     * names.  To support this, a closure deps.js file must
+     * be specified when generating the test C++ source.
+     * The specified libraries will be included with their transitive
+     * dependencies according to the deps file.
+     * @type {Array.<string>}
+     */
+    closureModuleDeps: [],
+
+    /**
      * Whether to run the accessibility checks.
      * @type {boolean}
      */