Add more fine-grained accessibility modes.

content/browser/accessibility/accessibility_mode_helper.h

-// Copyright 2014 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.
-
-#ifndef CONTENT_BROWSER_ACCESSIBILITY_ACCESSIBILITY_MODE_HELPER_H_
-#define CONTENT_BROWSER_ACCESSIBILITY_ACCESSIBILITY_MODE_HELPER_H_
-
-#include "content/common/accessibility_mode_enums.h"
-#include "content/common/content_export.h"
-
-namespace content {
-
-// Returns base accessibility mode constant, depends on OS version.
-CONTENT_EXPORT AccessibilityMode GetBaseAccessibilityMode();
-
-// Adds the given accessibility mode constant to the given accessibility mode
-// bitmap.
-CONTENT_EXPORT AccessibilityMode
-    AddAccessibilityModeTo(AccessibilityMode to, AccessibilityMode mode_to_add);
-
-// Removes the given accessibility mode constant from the given accessibility
-// mode bitmap, managing the bits that are shared with other modes such that a
-// bit will only be turned off when all modes that depend on it have been
-// removed.
-CONTENT_EXPORT AccessibilityMode
-    RemoveAccessibilityModeFrom(AccessibilityMode to,
-                                AccessibilityMode mode_to_remove);
-
-} //  namespace content
-
-#endif  // CONTENT_BROWSER_ACCESSIBILITY_ACCESSIBILITY_MODE_HELPER_H_