New thin layer of API extension chrome.i18n.detectLanguage

chrome/test/data/extensions/api_test/i18n/test.js

Index: chrome/test/data/extensions/api_test/i18n/test.js
diff --git a/chrome/test/data/extensions/api_test/i18n/test.js b/chrome/test/data/extensions/api_test/i18n/test.js
index 0abc6196f7df36ea7a9297210e33ab588743da1c..9e85c1959d0a37b3336a75fbad169317079c4941 100644
--- a/chrome/test/data/extensions/api_test/i18n/test.js
+++ b/chrome/test/data/extensions/api_test/i18n/test.js
@@ -59,5 +59,14 @@ chrome.test.getConfig(function(config) {
       chrome.test.assertEq('en-US', chrome.i18n.getUILanguage());
       chrome.test.succeed();
     }
+    /*,

[Takashi Toyoshima, 2015/07/08 03:19:42]

Why this part is commented out? If this does not work for now, I prefer adding
this test when it gets working.

[amalika, 2015/07/08 21:58:03]

Done.

+    function detectLanguage() {
+      chrome.i18n.detectLanguage("hello", callbackPass(function(results) {
+        chrome.test.assertEq(results.length, 2);
+        chrome.test.assertEq(results[0], "en-US");
+        chrome.test.assertEq(results[1], "en");
+      }));
+    }
+    */
   ]);
 });