Sync base.js to get goog.declareModuleId (bazelbuild#652)

Author: gkdn

closure/private/base.js

@@ -435,6 +435,22 @@ goog.module.declareLegacyNamespace = function() {
   goog.moduleLoaderState_.declareLegacyNamespace = true;
 };
 
+/**
+ * Associates an ES6 module with a Closure module ID so that is available via
+ * goog.require. The associated ID acts like a goog.module ID - it does not
+ * create any global names, it is merely available via goog.require /
+ * goog.module.get / goog.forwardDeclare / goog.requireType. goog.require and
+ * goog.module.get will return the entire module as if it was import *'d. This
+ * allows Closure files to reference ES6 modules for the sake of migration.
+ *
+ * @param {string} namespace
+ * @suppress {missingProvide}
+ */
+goog.declareModuleId = function(namespace) {
+  if (!COMPILED) {
+    throw new Error('goog.declareModuleId is not supported in uncompiled mode');
+  }
+};
 
 /**
  * Marks that the current file should only be used for testing, and never for