Lands http://codereview.chromium.org/3153008 for bryeung:

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

+// Copyright (c) 2010 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.
+
+// experimental.input API test for Chrome
+// browser_tests --gtest_filter=ExtensionApiTest.Input
+
+chrome.test.runTests([
+  function sendKeyboardEvent() {
+    var e = { 'type': 'keydown', 'keyIdentifier': 'A' };
+    chrome.experimental.input.sendKeyboardEvent(e, function() {
+      if (chrome.extension.lastError) {
+        // this is expected for now: no one is handling keys yet
+        // chrome.test.fail();
+      }
+      // when the browser is listening to events, we should check that
+      // this event was delivered as we expected.  For now, just succeed.
+      chrome.test.succeed();
+    });
+  },
+
+  function badKeyIdentifier() {
+    var e = { 'type': 'keydown', 'keyIdentifier': 'BogusId' };
+    chrome.experimental.input.sendKeyboardEvent(e, function() {
+      if (!chrome.extension.lastError) {
+        chrome.test.fail();
+      }
+      chrome.test.succeed();
+    });
+  },
+
+  function badEventType() {
+    var e = { 'type': 'BAD', 'keyIdentifier': 'A' };
+    chrome.experimental.input.sendKeyboardEvent(e, function() {
+      if (!chrome.extension.lastError) {
+        chrome.test.fail();
+      }
+      chrome.test.succeed();
+    });
+  },
+
+  function unmappedKeyIdentifier() {
+    var e = { 'type': 'keydown', 'keyIdentifier': 'Again' };
+    chrome.experimental.input.sendKeyboardEvent(e, function() {
+      if (!chrome.extension.lastError) {
+        chrome.test.fail();
+      }
+      chrome.test.succeed();
+    });
+  },
+]);