[chromium-reviews] Add getLanguage function to tabs extension

chrome/renderer/extensions/extension_api_client_unittest.cc

Index: chrome/renderer/extensions/extension_api_client_unittest.cc
===================================================================
--- chrome/renderer/extensions/extension_api_client_unittest.cc	(revision 20334)
+++ chrome/renderer/extensions/extension_api_client_unittest.cc	(working copy)
@@ -275,6 +275,24 @@
                "GetTab", "2");
 }
 
+#if defined(OS_WIN)
+TEST_F(ExtensionAPIClientTest, GetTabLanguage) {
+  ExpectJsFail("chrome.tabs.getLanguage(32, function(){}, 20);",
+               "Uncaught Error: Too many arguments.");
+
+  ExpectJsFail("chrome.tabs.getLanguage('abc', function(){});",
+               "Uncaught Error: Invalid value for argument 0. "
+               "Expected 'integer' but got 'string'.");
+
+  ExpectJsFail("chrome.tabs.getLanguage(1, 1);",
+               "Uncaught Error: Invalid value for argument 1. "
+               "Expected 'function' but got 'integer'.");
+
+  ExpectJsPass("chrome.tabs.getLanguage(null, function(){})",
+               "GetTabLanguage", "null");
+}
+#endif
+
 TEST_F(ExtensionAPIClientTest, GetSelectedTab) {
   ExpectJsFail("chrome.tabs.getSelected(32, function(){}, 20);",
                "Uncaught Error: Too many arguments.");