Add an accessibility API for events raised outside of the web content.

chrome/common/notification_type.h

 // Copyright (c) 2009 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 CHROME_COMMON_NOTIFICATION_TYPE_H_
 #define CHROME_COMMON_NOTIFICATION_TYPE_H_
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
 //
@@ skipping 780 matching lines @@
     // This notification is sent whenever the web database service has finished
     // loading the web database.  No details are expected.
     WEB_DATABASE_LOADED,
 
     // Purge Memory ------------------------------------------------------------
 
     // Sent on the IO thread when the system should try to reduce the amount of
     // memory in use, no source or details are passed. See memory_purger.h .cc.
     PURGE_MEMORY,
 
+    // Accessibility Notifications ---------------------------------------------
+
+    // Notification that a window in the browser UI (not the web content)
+    // was opened, for propagating to an accessibility extension.
+    // Details will be an AccessibilityWindowInfo.
+    ACCESSIBILITY_WINDOW_OPENED,
+
+    // Notification that a window in the browser UI was closed.
+    // Details will be an AccessibilityWindowInfo.
+    ACCESSIBILITY_WINDOW_CLOSED,
+
+    // Notification that a control in the browser UI was focused.
+    // Details will be an AccessibilityControlInfo.
+    ACCESSIBILITY_CONTROL_FOCUSED,
+
+    // Notification that a control in the browser UI had its action taken,
+    // like pressing a button or toggling a checkbox.
+    // Details will be an AccessibilityControlInfo.
+    ACCESSIBILITY_CONTROL_ACTION,
+
+    // Notification that text box in the browser UI had text change.
+    // Details will be an AccessibilityControlInfo.
+    ACCESSIBILITY_TEXT_CHANGED,
+
     // Count (must be last) ----------------------------------------------------
     // Used to determine the number of notification types.  Not valid as
     // a type parameter when registering for or posting notifications.
     NOTIFICATION_TYPE_COUNT
   };
 
   // TODO(erg): Our notification system relies on implicit conversion.
   NotificationType(Type v) : value(v) {}  // NOLINT
 
   bool operator==(NotificationType t) const { return value == t.value; }
   bool operator!=(NotificationType t) const { return value != t.value; }
 
   // Comparison to explicit enum values.
   bool operator==(Type v) const { return value == v; }
   bool operator!=(Type v) const { return value != v; }
 
   Type value;
 };
 
 inline bool operator==(NotificationType::Type a, NotificationType b) {
   return a == b.value;
 }
 inline bool operator!=(NotificationType::Type a, NotificationType b) {
   return a != b.value;
 }
 
 #endif  // CHROME_COMMON_NOTIFICATION_TYPE_H_