[Extensions] Expose enums on extension APIs.

extensions/renderer/resources/binding.js

Index: extensions/renderer/resources/binding.js
diff --git a/extensions/renderer/resources/binding.js b/extensions/renderer/resources/binding.js
index b1a3efcaca5002bb03d2918acec145572dd74e81..22ccb7bdc212aa69000fa5d63b5a9d1462b66b56 100644
--- a/extensions/renderer/resources/binding.js
+++ b/extensions/renderer/resources/binding.js
@@ -275,13 +275,35 @@ Binding.prototype = {
       mod = mod[name];
     }
 
-    // Add types to global schemaValidator, the types we depend on from other
-    // namespaces will be added as needed.
     if (schema.types) {
       $Array.forEach(schema.types, function(t) {
         if (!isSchemaNodeSupported(t, platform, manifestVersion))
           return;
+
+        // Add types to global schemaValidator; the types we depend on from
+        // other namespaces will be added as needed.
         schemaUtils.schemaValidator.addTypes(t);
+
+        // Generate symbols for enums.
+        var enumValues = t['enum'];
+        if (enumValues) {
+          // Type IDs are qualified with the namespace during compilation,
+          // unfortunately, so remove it here.
+          logging.DCHECK(
+              t.id.substr(0, schema.namespace.length) == schema.namespace);
+          // Note: + 1 because it ends in a '.', e.g., 'fooApi.Type'.
+          var id = t.id.substr(schema.namespace.length + 1);
+          mod[id] = {};
+          $Array.forEach(enumValues, function(enumValue) {
+            // Note: enums can be declared either as a list of strings
+            // ['foo', 'bar'] or as a list of objects
+            // [{'name': 'foo'}, {'name': 'bar'}].
+            enumValue =
+                enumValue.hasOwnProperty('name') ? enumValue.name : enumValue;
+            if (enumValue)  // Avoid setting any empty enums.
+              mod[id][enumValue] = enumValue;
+          });
+        }
       }, this);
     }