Add a button on status bar to indicate that accessibility is enabled.

chrome/browser/chromeos/status/accessibility_menu_button_browsertest.cc

+// 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.
+
+#include "chrome/browser/chromeos/status/accessibility_menu_button.h"
+
+#include "chrome/browser/chromeos/accessibility_util.h"
+#include "chrome/browser/chromeos/frame/browser_view.h"
+#include "chrome/browser/chromeos/status/status_area_view.h"
+#include "chrome/browser/chromeos/view_ids.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_window.h"
+
+namespace chromeos {
+
+class AccessibilityMenuButtonTest : public InProcessBrowserTest {
+ protected:
+  AccessibilityMenuButtonTest() : InProcessBrowserTest() {
+  }
+
+  AccessibilityMenuButton* GetAccessibilityMenuButton() {
+    BrowserView* view = static_cast<BrowserView*>(browser()->window());
+    return static_cast<StatusAreaView*>(view->
+        GetViewByID(VIEW_ID_STATUS_AREA))->accessibility_view();
+  }
+};
+
+IN_PROC_BROWSER_TEST_F(AccessibilityMenuButtonTest,
+                       VisibilityIsSyncedWithPreference) {
+  AccessibilityMenuButton* button = GetAccessibilityMenuButton();
+  ASSERT_TRUE(button != NULL);
+
+  accessibility::EnableAccessibility(true, NULL);
+  EXPECT_TRUE(button->IsVisible());
+
+  accessibility::EnableAccessibility(false, NULL);
+  EXPECT_FALSE(button->IsVisible());
+}
+
+}  // namespace chromeos