Switch AccessibilityMode to be a bitmap

content/public/browser/browser_accessibility_state.h

 // Copyright (c) 2012 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_PUBLIC_BROWSER_BROWSER_ACCESSIBILITY_STATE_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_ACCESSIBILITY_STATE_H_
 
 #include "base/callback_forward.h"
 
 #include "content/common/content_export.h"
 
 namespace content {
 
 // The BrowserAccessibilityState class is used to determine if the browser
 // should be customized for users with assistive technology, such as screen
 // readers.
 class CONTENT_EXPORT BrowserAccessibilityState {
  public:
   virtual ~BrowserAccessibilityState() { }
 
   // Returns the singleton instance.
   static BrowserAccessibilityState* GetInstance();
 
   // Enables accessibility for all running tabs.
   virtual void EnableAccessibility() = 0;
 
-  // Disables accessibility for all running tabs.
+  // Disables accessibility for all running tabs. (Only if accessibility is not
+  // required by a command line flag or by a platform requirement.)
   virtual void DisableAccessibility() = 0;
 
+  // Resets accessibility to the platform default for all running tabs.
+  // This is probably off, but may be on, if --force_renderer_accessibility is
+  // passed, or EditableTextOnly if this is Win7.
+  virtual void ResetAccessibilityMode() = 0;
+
   // Called when screen reader client is detected.
   virtual void OnScreenReaderDetected() = 0;
 
   // Returns true if the browser should be customized for accessibility.
   virtual bool IsAccessibleBrowser() = 0;
 
   // Add a callback method that will be called once, a small while after the
   // browser starts up, when accessibility state histograms are updated.
   // Use this to register a method to update additional accessibility
   // histograms.
   virtual void AddHistogramCallback(base::Closure callback) = 0;
 
   virtual void UpdateHistogramsForTesting() = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_ACCESSIBILITY_STATE_H_