Added more tests for IncognitoModeAvailability.

chrome/browser/tab_contents/render_view_context_menu_test_util.cc

+// Copyright (c) 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.
+
+#include "chrome/browser/tab_contents/render_view_context_menu_test_util.h"
+
+TestRenderViewContextMenu::TestRenderViewContextMenu(
+    content::WebContents* web_contents,
+    content::ContextMenuParams params)
+    : RenderViewContextMenu(web_contents, params) {}
+
+TestRenderViewContextMenu::~TestRenderViewContextMenu() {}
+
+void TestRenderViewContextMenu::PlatformInit() {}
+
+void TestRenderViewContextMenu::PlatformCancel() {}
+
+bool TestRenderViewContextMenu::GetAcceleratorForCommandId(
+    int command_id,
+    ui::Accelerator* accelerator) {
+  return false;
+}
+
+bool TestRenderViewContextMenu::IsItemPresent(int command_id) {
+  return menu_model_.GetIndexOfCommandId(command_id) != -1;
+}