Add an accessibility mode for editable text fields only.

content/common/view_message_enums.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_COMMON_VIEW_MESSAGES_ENUMS_H_
 #define CONTENT_COMMON_VIEW_MESSAGES_ENUMS_H_
 
+#include "ipc/ipc_message_macros.h"
+
 // Values that may be OR'd together to form the 'flags' parameter of a
 // ViewHostMsg_UpdateRect_Params structure.
 struct ViewHostMsg_UpdateRect_Flags {
   enum {
     IS_RESIZE_ACK = 1 << 0,
     IS_RESTORE_ACK = 1 << 1,
     IS_REPAINT_ACK = 1 << 2,
   };
   static bool is_resize_ack(int flags) {
     return (flags & IS_RESIZE_ACK) != 0;
@@ skipping 23 matching lines @@
     RESTORE,
 
     // Like RESTORE, except that the navigation contains POST data.
     RESTORE_WITH_POST,
 
     // Navigation type not categorized by the other types.
     NORMAL
   };
 };
 
+enum AccessibilityMode {
+  // WebKit accessibility is off and no accessibility information is
+  // sent from the renderer to the browser process.
+  AccessibilityModeOff,
+
+  // WebKit accessibility is on, but only limited information about
+  // editable text nodes is sent to the browser process. Useful for
+  // implementing limited UIA on tablets.
+  AccessibilityModeEditableTextOnly,
+
+  // WebKit accessibility is on, and the full accessibility tree is synced
+  // to the browser process. Useful for screen readers and magnifiers.
+  AccessibilityModeComplete,
+};
+
 #endif  // CONTENT_COMMON_VIEW_MESSAGES_ENUMS_H_