Make limitations for input.ime.sendKeyEvents API.

chrome/test/data/extensions/api_test/input_ime_nonchromeos/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.
 
+var failToSendKeyEvents = 'Could not send key events';
+
 chrome.test.runTests([
   function testActivate() {
     var focused = false;
     var activated = false;
     chrome.input.ime.onFocus.addListener(function(context) {
       if (context.type == 'none') {
         chrome.test.fail();
         return;
       }
       focused = true;
@@ skipping 33 matching lines @@
       chrome.test.assertFalse(win.document.webkitHidden);
       // test for security origin.
       // If security origin is not correctly set, there will be securtiy
       // exceptions when accessing DOM or add event listeners.
       win.addEventListener('unload', function() {});
       chrome.test.succeed();
     });
   },
 
   function testSendKeyEvents() {
+    // Sends a normal character key.
     chrome.input.ime.sendKeyEvents({
       'contextID': 1,
       'keyData': [{
         'type': 'keydown',
         'requestId': '0',
         'key': 'a',
         'code': 'KeyA'
       }, {
         'type': 'keyup',
         'requestId': '1',
         'key': 'a',
         'code': 'KeyA'
      }]
+    }, function() {
+      // Normal character key should be allowed to send on any page.
+      chrome.test.assertNoLastError();
+    });
+
+    // Sends Ctrl+A that should fail on special pages.
+    chrome.input.ime.sendKeyEvents({
+      'contextID': 1,
+      'keyData': [{
+        'type': 'keydown',
+        'requestId': '2',
+        'key': 'a',
+        'code': 'KeyA',
+        'ctrlKey': true
+      }, {
+        'type': 'keyup',
+        'requestId': '3',
+        'key': 'a',
+        'code': 'KeyA',
+        'ctrlKey': true
+     }]
+    }, function() {
+      if (chrome.runtime.lastError) {
+        chrome.test.assertEq(failToSendKeyEvents,

[Devlin, 2016/06/23 18:43:22]

nit: indentation
chrome.test.assertEq(failToSendKeyEvents,
                     chrome.runtime.lastError.message);
or if that doesn't fit
chrome.test.assertEq(
    failToSendKeyEvents,
    chrome.runtime.lastError.message);

[Azure Wei, 2016/06/24 06:38:19]

Done. Thanks for the comments.

+          chrome.runtime.lastError.message);
+      }
+    });
+
+    // Sends Tab key that should fail on special pages.
+    chrome.input.ime.sendKeyEvents({
+      'contextID': 1,
+      'keyData': [{
+        'type': 'keydown',
+        'requestId': '4',
+        'key': '\u0009',
+        'code': 'Tab'
+      }]
+    }, function() {
+      if (chrome.runtime.lastError) {
+        chrome.test.assertEq(failToSendKeyEvents,
+          chrome.runtime.lastError.message);
+      }
     });
     chrome.test.succeed();
   }
 ]);