[Extensions Bindings] Add support for custom property types

chrome/test/data/extensions/api_test/native_bindings/extension/background.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 if (!chrome || !chrome.test)
   throw new Error('chrome.test is undefined');
 
 var portNumber;
 
 // This is a good end-to-end test for two reasons. The first is obvious - it
@@ skipping 106 matching lines @@
         });
       });
     });
   },
   function testLastError() {
     chrome.runtime.setUninstallURL('chrome://newtab', function() {
       chrome.test.assertLastError('Invalid URL: "chrome://newtab".');
       chrome.test.succeed();
     });
   },
+  function testStorage() {
+    // Check API existence; StorageArea functions.
+    chrome.test.assertTrue(!!chrome.storage);
+    chrome.test.assertTrue(!!chrome.storage.local, 'no local');
+    chrome.test.assertTrue(!!chrome.storage.local.set, 'no set');
+    chrome.test.assertTrue(!!chrome.storage.local.get, 'no get');
+    // Check some properties.
+    chrome.test.assertTrue(!!chrome.storage.local.QUOTA_BYTES,
+                           'local quota bytes');
+    chrome.test.assertFalse(!!chrome.storage.local.MAX_ITEMS,
+                            'local max items');
+    chrome.test.assertTrue(!!chrome.storage.sync, 'sync');
+    chrome.test.assertTrue(!!chrome.storage.sync.QUOTA_BYTES,
+                           'sync quota bytes');
+    chrome.test.assertTrue(!!chrome.storage.sync.MAX_ITEMS,
+                           'sync max items');
+    chrome.test.assertTrue(!!chrome.storage.managed, 'managed');
+    chrome.test.assertFalse(!!chrome.storage.managed.QUOTA_BYTES,
+                            'managed quota bytes');
+    chrome.storage.local.set({foo: 'bar'}, () => {
+      chrome.storage.local.get('foo', (results) => {
+        chrome.test.assertTrue(!!results, 'no results');
+        chrome.test.assertTrue(!!results.foo, 'no foo');
+        chrome.test.assertEq('bar', results.foo);
+        chrome.test.succeed();
+      });
+    });
+  },
 ];
 
 chrome.test.getConfig(config => {
   chrome.test.assertTrue(!!config, 'config does not exist');
   chrome.test.assertTrue(!!config.testServer, 'testServer does not exist');
   portNumber = config.testServer.port;
   chrome.test.runTests(tests);
 });