Add hack so VoiceOver speaks updates to injected live regions.

content/browser/accessibility/browser_accessibility_mac.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_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MAC_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MAC_H_
 
 #include <map>
 #include <utility>
 #include <vector>
 
 #include "content/browser/accessibility/browser_accessibility.h"
 
 @class BrowserAccessibilityCocoa;
 
 namespace content {
 
 class BrowserAccessibilityMac : public BrowserAccessibility {
  public:
   // BrowserAccessibility overrides.
   virtual void NativeReleaseReference() OVERRIDE;
   virtual bool IsNative() const OVERRIDE;
   virtual void OnDataChanged() OVERRIDE;
 
   // The BrowserAccessibilityCocoa associated with us.
   BrowserAccessibilityCocoa* native_view() const {
     return browser_accessibility_cocoa_;
   }
 
+  // Detach the BrowserAccessibilityCocoa object and then recreate it.
+  // This is only used to work around VoiceOver bugs by forcing VoiceOver
+  // to rebuild its internal state.
+  void RecreateNativeObject();

[David Tseng, 2014/05/09 03:09:47]

FYI; I forgot that the BAC creates its children (and keeps it as a property).
This method, therefore, would be more appropriately named RecreateNativeSubtree.

[dmazzoni, 2014/05/09 06:10:30]

Oh! Good thought.

Better idea, let's preserve the children? I added some code to swap the
children, could you take another look?

Unfortunately this doesn't make VO stay on static text, but it seems it ought to
be a bit more efficient, right?

+
  private:
   // This gives BrowserAccessibility::Create access to the class constructor.
   friend class BrowserAccessibility;
 
   BrowserAccessibilityMac();
 
   // Allows access to the BrowserAccessibilityCocoa which wraps this.
   // BrowserAccessibility.
   // We own this object until our manager calls ReleaseReference;
   // thereafter, the cocoa object owns us.
   BrowserAccessibilityCocoa* browser_accessibility_cocoa_;
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityMac);
 };
 
 }  // namespace content
 
 #endif // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MAC_H_