Implement Command Line Private extension API

chrome/test/data/extensions/api_test/command_line/basics/test.js

+// Copyright 2013 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.
+
+// These string constants should be consistent with those in
+// chrome/browser/extensions/api/command_line_private/.
+var kTestCommandLineSwitch = 'command-line-private-api-test-foo';
+var kEmptySwitchName = 'Switch name is empty.';
+
+var kNonExistingSwitch = 'foo-bar-non-existing-switch';
+
+var pass = chrome.test.callbackPass;
+var fail = chrome.test.callbackFail;
+var assertEq = chrome.test.assertEq;
+
+chrome.tests.runTests([
+
+  function testHaveSwitch() {
+    chrome.commandLinePrivate.hasSwitch(kTestCommandLineSwitch,
+        pass(function(result) {
+      assertEq(result, true);

[not at google - send to devlin, 2013/04/15 12:20:15]

assertTrue(result)?

[方觉(Fang Jue), 2013/04/15 23:25:03]

Done.

+    }));
+  },
+
+  function testNotHaveSwitch() {
+    chrome.commandLinePrivate.hasSwitch(kNonExistingSwitch,
+        pass(function(result) {
+      assertEq(result, false);

[not at google - send to devlin, 2013/04/15 12:20:15]

assertFalse(result)?

[方觉(Fang Jue), 2013/04/15 23:25:03]

Done.

+    }));
+  },
+
+  function testInvalidArgs() {
+    chrome.commandLinePrivate.hasSwitch('', fail(kEmptySwitchName));
+  }
+
+]);