Adds extension events for custom dictionary load/change.

chrome/test/data/extensions/api_test/input_method/background.js

 // Copyright (c) 2011 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.
 
 var kNewInputMethodTemplate = '_comp_ime_{EXT_ID}xkb:fr::fra';
 var kInitialInputMethodRegex = /_comp_ime_([a-z]{32})xkb:us::eng/;
 var kInvalidInputMethod = 'xx::xxx';
 
 var testParams = {
   initialInputMethod: '',
@@ skipping 81 matching lines @@
         foundInitialInputMethod = true;
       if (inputMethods[i].id == testParams.newInputMethod)
         foundNewInputMethod = true;
     }
     chrome.test.assertTrue(foundInitialInputMethod);
     chrome.test.assertTrue(foundNewInputMethod);
     chrome.test.succeed();
   });
 }
 
-function initDictionaryNotLoadedTest() {
-  // This test must come first because the dictionary is only lazy loaded after
-  // this call is made.
-  chrome.inputMethodPrivate.fetchAllDictionaryWords(function(words) {
-    chrome.test.assertTrue(words === undefined);
-    chrome.test.assertTrue(!!chrome.runtime.lastError);
-    chrome.test.succeed();
+function fetchDictionaryTests() {
+  var fetchWordsPromise = new Promise(function(resolve, reject) {
+    chrome.inputMethodPrivate.onDictionaryLoaded.addListener(function() {
+      chrome.inputMethodPrivate.fetchAllDictionaryWords(resolve);
+    });
+    chrome.inputMethodPrivate.fetchAllDictionaryWords(resolve);
   });
-}
-
-function initDictionaryTests() {
-  chrome.inputMethodPrivate.fetchAllDictionaryWords(function(words) {
+  fetchWordsPromise.then(function(words) {
     chrome.test.assertTrue(words !== undefined);
     chrome.test.assertTrue(words.length === 0);
     chrome.test.succeed();
   });
 }
 
 function addWordToDictionaryTest() {
-  chrome.inputMethodPrivate.addWordToDictionary('helloworld', function() {
+  var wordToAdd = 'helloworld';
+  chrome.inputMethodPrivate.addWordToDictionary(wordToAdd, function() {
     chrome.inputMethodPrivate.fetchAllDictionaryWords(function(words) {
       chrome.test.assertTrue(words.length === 1);
-      chrome.test.assertEq(words[0], 'helloworld');
+      chrome.test.assertEq(words[0], wordToAdd);
       chrome.test.succeed();
     });
   });
 }
 
+function dictionaryChangedTest() {
+  var wordToAdd = 'helloworld2';
+  chrome.inputMethodPrivate.onDictionaryChanged.addListener(
+      function(added, removed) {
+        chrome.test.assertTrue(added.length === 1);
+        chrome.test.assertTrue(removed.length === 0);
+        chrome.test.assertEq(added[0], wordToAdd);
+        chrome.test.succeed();
+      });
+  chrome.inputMethodPrivate.addWordToDictionary(wordToAdd);
+}
+
 chrome.test.sendMessage('ready');
 chrome.test.runTests(
     [initTests, setTest, getTest, observeTest, setInvalidTest, getListTest,
-     initDictionaryNotLoadedTest, initDictionaryTests,
-     addWordToDictionaryTest]);
+     fetchDictionaryTests, addWordToDictionaryTest, dictionaryChangedTest]);