Add chrome.inputMethodPrivate.onImeMenuActivationChanged API.

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 174 matching lines @@
               chrome.test.assertTrue(removed.length === 0);
               chrome.test.assertEq(added[0], wordToAdd);
               chrome.test.succeed();
             });
       })
       .then(function() {
         return getAddPromise(wordToAdd);
       });
 }
 
+function imeMenuConfigTest() {
+  chrome.inputMethodPrivate.getInputMethodConfig(function(config) {
+    chrome.test.assertTrue(config["isImeMenuActivated"]);
+    chrome.test.succeed();
+  });

[stevenjb, 2016/01/20 18:33:43]

This tests the initial state, but not the event. See e.g.
dictionaryChangedTest() above.

[Azure Wei, 2016/01/21 10:25:07]

imeMenuActivationChangedTest() is added to test the state change event.

+}
+
 chrome.test.sendMessage('ready');
 chrome.test.runTests(
     [initTests, setTest, getTest, observeTest, setInvalidTest, getListTest,
      loadDictionaryAsyncTest, fetchDictionaryTest, addWordToDictionaryTest,
-     dictionaryChangedTest]);
+     ictionaryChangedTest, imeMenuConfigTest]);

[stevenjb, 2016/01/20 18:33:43]

'd' missing at beginning of line. (Did this succeed locally?)

[Azure Wei, 2016/01/21 10:25:07]

Sorry about the mistake.